In the question below, four words are highlighted, which may not be correctly placed. Choose the correct replacement among the highlighted words to make the sentence grammatically correct and meaningful.

During the annual summit, the committee plans to fellow (A) the lead analyst as a distinguished honor (B) of the council's advisory board (C) for her pioneering research (D) in climate policy.

The correct answer is Only (A)-(B).

Step-by-step explanation:

1. Analyze the original sentence:
"During the annual summit, the committee plans to fellow (A) the lead analyst as a distinguished honor (B) of the council's advisory board (C) for her pioneering research (D) in climate policy."

In the given sentence:
- The phrase "plans to fellow" uses "fellow" incorrectly following the infinitive marker "to". An action verb like "honor" is required here.
- The phrase "distinguished honor of the council's advisory board" uses "honor" where a noun referring to a person or position is needed. The word "fellow" correctly describes an appointed or recognized member of an advisory board.

2. Swap (A) and (B):
Replacing word (A) "fellow" with word (B) "honor" gives:
"During the annual summit, the committee plans to honor (A) the lead analyst as a distinguished fellow (B) of the council's advisory board (C) for her pioneering research (D) in climate policy."

This sentence is grammatically sound, coherent, and meaningful.

3. Check words (C) and (D):
- Word (C) "board" correctly forms the noun phrase "advisory board".
- Word (D) "research" correctly forms the phrase "pioneering research".
Thus, words (C) and (D) are properly placed and require no change.

Hence, the only required replacement is between (A) and (B).