The answer is most likely the second one
C is the correct answer because sentence A is not properly correct, and B is not properly correct.
Hope this helps!
This is a fact. An opinion is described as something that has no hard efficiency behind this such as Michael Jordan is the best player in the world. You cannot prove this and it is nearly something you think. Other people don't have to agree.
B. it would change how the sailors voiced their concerns. "mutterings" suggests that it was only something the crew was saying under their breath, or saying only between themselves--privately. "conversations" is much more general, giving you the idea that they spoke about it openly. when you think "muttering" you might get an image of a kid muttering some smart reply under their breath in response to authority. it's like a petty complaint, almost. when you hear the word "conversation" you might picture a group of people sitting together having a full discussion. changing from one word to the other definitely changes the image of how the sailors are speaking amongst themselves.
I just took a test with that in it a little while ago I believe its A
