Let's break down the sentence blank by blank, looking for logical connections and the precise meaning required. The key is to understand the overall tone and imagery created by the description of the author's house.

- "The reclusive author lived in a (i) $\(\qquad\)$ atmosphere; her house was ornamented with black lace curtains on every window and (ii) $\(\qquad\)$ antique coffins in place of beds."
- The phrase "reclusive author" suggests someone who lives isolated and perhaps unconventionally.
- The description of the house ("black lace curtains on every window" and "antique coffins in place of beds") creates a very specific, dark, and unusual aesthetic.
- Blank (i): This blank describes the overall "atmosphere" of the house, which is characterized by black lace and coffins.
- A. dilettantish: Showing a superficial interest in an art or a branch of knowledge. This describes a person's approach, not an atmosphere.
- B. garrulous: Excessively talkative, especially on trivial matters. This describes a person, not an atmosphere.
- C. macabre: Disturbing and horrifying because of involvement with or depiction of death and injury. This perfectly fits the imagery of black lace and especially "coffins in place of beds," which are strongly associated with death and the unsettling.

So, Blank (i) is C. macabre.

- Blank (ii): This blank describes the "antique coffins." We need a word that fits the overall "macabre" atmosphere and the unusual choice of coffins as beds.
- D. ornate: Made in an intricate shape or decorated with complex patterns. While coffins can be ornate, this word doesn't capture the disturbing or unusual aspect implied by the context of using them as beds and the "macabre" atmosphere. However, it's a plausible descriptor for an antique coffin's appearance.
- E. amiable: Having or displaying a friendly and pleasant manner. This is the opposite of the implied atmosphere.
- F. innocuous: Not harmful or offensive. This is the opposite of the implied atmosphere.
Now for Blank (ii):
The coffins are "antique." They are "in place of beds." This is the key to the macabre atmosphere.

Are they "ornate"? Yes, antique items often are. This is a descriptive quality.
Are they "amiable"? No.
Are they "innocuous"? No.
Let's consider the possibility that the question intends for the description of the coffins to contribute directly to the macabre atmosphere. "Ornate" describes their appearance, which can be part of the aesthetic.

Let's think if there's a different interpretation of the sentence or a common pairing. The structure is "ornamented with black lace curtains... and $X$ antique coffins." $X$ describes the coffins.

If the atmosphere is macabre, the coffins are central to it. "Ornate" describes a visual quality.

This is a tricky one if "ornate" is the intended answer, as it describes a visual characteristic rather than reinforcing the "macabre" nature directly. However, antique coffins would likely be ornate.

Let's assume the question is looking for a descriptive word for the coffins that fits the overall unusual and somewhat gothic theme. "Ornate" fits the description of "antique" and contributes to a rich, if dark, decor.

Putting It Together:
"The reclusive author lived in a macabre atmosphere; her house was ornamented with black lace curtains on every window and ornate antique coffins in place of beds."

This makes sense. The macabre atmosphere is created by the black lace and the ornate antique coffins used as beds.

The final answer is $\(\mathrm{C}, \mathrm{D}\)$.