Real ACT (3rd Edition) Test 5 English

On number 21, page 723, I put my answer choice as D but the answer key says it is choice C. I was going back and forth between A and D as my choice, but C is the least likely option. Can someone confirm that it is definitely not choice C? I’m starting to think it might be choice A, so if someone could also tell me what the correct answer is it would be greatly appreciated.

The answer is C. It doesn’t make sense to separate the phrase “cause of justice”. Therefore, the phrase “in their various ways” can’t go there.

OP, you’ll get more responses if you include the question and answer choices