Which of the Following Statements Is True

Which of the following statements is true?

A) In carriers, the recessive allele causes an intermediate phenotype.
B) With recessive genetic disorders, if both parents are carriers, the offspring will all be affected.
C) In recessive genetic disorders, the mother and/or father of an affected individual must also be affected.
D) With dominant genetic disorders, the mother and/or father of an affected individual must also be affected.
E) The dominant allele is masked in homozygous dominant individuals.