Genes from Many Isolates of the Influenza Virus Have Been

Multiple Choice

Genes from many isolates of the influenza virus have been sequenced.In certain regions of the genome,nonsynonymous substitutions have been found to occur much more frequently than synonymous substitutions.From this pattern we can infer that

A) a great deal of genetic drift is taking place.
B) most of the amino acid changes are neutral.
C) strong stabilizing selection is acting on this gene.
D) strong positive selection is acting on this gene.
E) mutations that change the amino acid are disadvantageous.