When Two Genes from Two Different People Are Sequenced and Aligned,it

When two genes from two different people are sequenced and aligned,it is discovered that there are multiple sequence differences in the coding segment DNA level.However,when the proteins formed by the genes have their amino acids sequenced,there is no difference observed between the two.What is the most likely explanation for this observation?

A) The mutations are corrected at the protein level after translation has occurred.
B) The mutations lie at locations where they don't affect protein sequence due to degeneracy of the genetic code.
C) The mutations are repaired at the mRNA level after transcription has occurred,but before translation.
D) Mutations at the DNA level are not reflected in proteins produced.
E) RNA processing removes the different segments from the mRNA molecules of each person prior to translation.