What Is the Most Likely Explanation for the Expression of Responses

What is the most likely explanation for the expression of responses related to pleiotropy?

A) The same gene may have more than one chromosome locus.
B) The protein coded for by the single gene is an important component of more than one tissue.
C) The silencing of a gene allele inherited from one parent is expressed differently depending on which parent contributed the silenced allele.
D) The same disorder may have an autosomal-dominant inheritance pattern, an autosomal-recessive inheritance pattern, and an X-linked-recessive inheritance pattern.