Molecular evidence in support of natural selection includes
a. the nearly universal genetic code.
b. the presence of vestigial structures.
c. a tendency toward perfect, unchanging dna in various species.
d. the transmission of acquired characteristics by dna.

Natural selection is the process in which the organism that is fit is adopted by the environment and it survive
Molecular evidence in support of natural selection includes
 the nearly universal genetic code
because all the organisms have same genetic code and this evidence support the natural selection at molecular level 
so correct option is A
hope it elps