Question

1. what revision, if any, should be made in sentence 21?

even when the league agreed on a resolution, there was no way to make member countries adhere to it.
even when the league agreed, there was no way to make member countries adhere to it on a resolution.
even when the league agreed on a resolution, there was no way to make member countries adhere to and follow a resolution.
no change is needed.

Explanation:

The first option is the grammatically correct and logically clear version. The second option misplaces the phrase "on a resolution," breaking the logical flow. The third option uses redundant phrasing ("adhere to and follow"). The original (implied as the first option's structure) is correct, so no change is not needed; the first option is the proper revision if the original was flawed, but the first option itself is the correct sentence.

Answer:

A. Even when the league agreed on a resolution, there was no way to make member countries adhere to it.