Cancer Does Not Typically Follow a Mendelian Pattern of Inheritance

Cancer does not typically follow a Mendelian pattern of inheritance because it is usually caused by

A) two gene variants, one dominant and one recessive, and no environmental input.
B) specific combinations of alleles and an environmental factor.
C) specific combinations of an environmental factor and one dominant gene variant.
D) environmental insults and no genes at all.
E) genes that cause death before birth.