I think it is A. C does not make sence to me. D is wrong because it takes years for these things to happen. Same for B. It would only take hours to dig a trench. I am going With A.
25% if i am remembering correctly BUT DONT GO BY WHAT I SAID
4-c
5-b
6-a
7-d
8-c
hope this helps
Answer:
krill is the right answer
