1) Explanation

Let's break down the sentence to understand the context and the meaning required for the blank:
- "The speed with which an Internet user can now communicate with people all over the world has led to $\qquad$ advances in information management."
- The phrase "speed with which an Internet user can now communicate with people all over the world" describes a highly impactful and modern development.
- This development "has led to advances in information management." The blank describes the nature of these advances.
- Given the revolutionary nature of global internet communication, the advances in information management would logically be profound, new, and groundbreaking.

Therefore, the blank needs words that mean new, groundbreaking, or significantly transformative.

Let's evaluate the given options:
- A. antediluvian: Of or belonging to the time before the biblical Flood; old-fashioned or primitive. This is the opposite of what's needed.
- B. obsolescent: Becoming obsolete; going out of use. This is also the opposite of what's needed.
- C. revolutionary: Involving or causing a complete or dramatic change. This perfectly fits the idea of profound and groundbreaking advances brought about by rapid global communication.
- D. eclectic: Deriving ideas, style, or taste from a broad and diverse range of sources. This describes a style or approach, not the nature of advances in terms of their newness or impact.
- E. innovative: Featuring new methods, ideas, or products; original and creative. This is a strong synonym for "revolutionary" in this context, describing advances that are new and groundbreaking.
- F. inchoate: Just begun and so not fully formed or developed; rudimentary. This implies something embryonic or incomplete, which doesn't fit the idea of significant "advances."

Conclusion:

The context clearly indicates that the advances in information management are significant and transformative due to the "speed" and global reach of Internet communication. Both "revolutionary" and "innovative" convey this meaning effectively.

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