A dominant allele is ___________________________.?

The correct choice is B. A dominant allele prevents the showing of other traits because it is either (CAPITALCAPITAL) or (CAPITALlowercase), while recessive alleles are always shown as (lowercaselowercase). So long as there is a CAPITAL the trait is dominant. Unless, of course, there is incomplete dominance, and then both the dominant and the recessive traits will show.