Which of the Following Statements Is True

Which of the following statements is true?

A) Expressivity is the term used to describe the balanced genetic output from a hemizygous condition.
B) Genomic anticipation refers to observations that a genetic disorder occurs at an earlier age in successive generations,whereas genetic imprinting occurs when gene expression varies depending on parental origin.
C) Genomic imprinting occurs when one allele converts another.
D) The term expressivity defines the percentage of individuals who show at least some degree of expression of a mutant genotype.
E) Penetrance specifically refers to the expression of lethal genes in heterozygotes.