The Ultimate Test of Whether Natural Selection Will Favour a Particular

The ultimate test of whether natural selection will favour a particular phenotype(and its underlying genotype) is

A) the nature of the adaptive advantage it confers on organisms.
B) whether the animal is a mammal or non-mammal.
C) how often the underlying genes express themselves.
D) whether the organism's behaviour involves feeding or reproduction.
E) whether it confers a competitive advantage over other species.