The answer is B because a metaphor is a comparison that dosent use like or as which is the opposite of simile. Simile is a comparison of two things using like or as.
"Without sea ice, arctic plants and animals must either adapt or migrate. If they can’t, they will go extinct."
"If that isn’t enough, people who live in coastal communities within the Arctic Circle are also battling erosion along their coastlines."
"(These communities must relocate inland or their homes and land could be washed out to sea.)"
"(For ice in the Arctic, it’s a race against time. If humans do not change what we are doing to the global climate, the ice will continue to disappear and life as we know it will be altered.)"
So as to not expose the truth. I’m unsure about the background of the question
