The correct choices are (C) iconoclasm, (E) debunk, and (G) moribund.

The Logic Breakdown
Blank (i): The sentence describes scientists trying to "replace" a traditional, long-held idea with a radical new view. The act of attacking or rejecting cherished beliefs and established institutions is called iconoclasm (C).
- Moderation ( $A$ ) and Conservatism ( $B$ ) would imply protecting traditional views of the family, not seeking to replace them with something negative.

Blank (ii): We need a verb that describes what scientists did to the old idea ("the family as a healthy force") before they could replace it.
- Debunk (E) means to expose the falseness of a myth or idea. This fits the "iconoclastic" goal of tearing down an established belief.
- Promote ( $D$ ) and Iconize ( $F$ ) are the exact opposite of what you do when you are trying to "replace" an old view with a negative one.

Blank (iii): This blank describes the new view that replaced the old one. Since the scientists were attacking the idea of the family being "healthy and stabilizing," the new view must be negative.
- Moribund (G) means in a dying state or near death; lacking vitality. This provides the sharpest contrast to "healthy and stabilizing."
- Progressive (H) and Paramount (I) (meaning of supreme importance) are both positive or neutral, which would not fit the "iconoclastic" attempt to tear down the family's reputation.

The "Replace" Logic
The structure of the sentence is: During an era of [Breaking Traditions], scientists [Attacked] the [Positive View] and replaced it with a [Negative View].

Why the others fail:
If you chose Conservatism (B) for the first blank, the rest of the sentence would fall apart because a conservative scientist would want to Promote (D) the family as a Paramount (I) force, rather than trying to debunk it. The logic must be consistent from the era's name to the final description.