OE
The blank is about both the leadership and the “stridency of their rhetoric”—you need the relationship between those two things. “While” is a reversal signal. In the first part of the sentence, the protests are “uncompromising.” Thus, in the second part, they should be softer, more on the side of compromising. Since “stridency” means harshness and is on the same side as “uncompromising,” the group thus chose to reduce or tone down the stridency.
Metamorphose, gild, wane, and succor do not contain any pairs. Wane means “decrease” and is an attractive trap answer. However, wane is an intransitive verb—that is, something (such as the moon) wanes on its own; you can’t wane an object. Therefore, the word does not fit in this sentence
Metamorphose (change) could work, but it doesn’t indicate the direction ofthe change (increase or decrease), which the blank needs to do in order to show that the leaders “wisely” chose to do something. Gild (cover in gold; give a deceitfully pleasing appearance to) and succor (aid, assist, or relieve) have no relationship.
Answer: D,F