Genetics is the most important factor that affects your physical fitness.
a. true
b. false

This is false. Everyone is unique in this aspect and although genetics can help you, or make life harder, it also falls down to personal behavior and habits. There are no genetics that can save you from constant overeating and there are no genetics that can prevent you from working out, at least to your possible extent.

I think it would be the option "C"

-I'm not sure-