Need help please. It's urgent about identify plot structure Thank you As soon as he had escaped from the alien ship, Walter ran back to the science lab to make sure that his brother was still alive. He was, but barely. Walter hoped that the strange serum would save him.

Which section of the plot does this passage best represent?
a) falling action
b) rising action
c) climax
d) exposition
e) resolution
Note: I was confuse between a) and c) . Please give opinion.