In Most Organisms, Genes Encoded by MtDNA and CpDNA Are

In most organisms, genes encoded by mtDNA and cpDNA are inherited from a single parent. A gamete may contain more than one distinct type of mtDNA or cpDNA; in these cases, random segregation of the organelle DNA may produce phenotypic variation within a single organism or it may produce different degrees of phenotypic expression among progeny.
-In a few organisms, traits encoded by mtDNA can be inherited from either parent. This observation indicates that, in these organisms,

A) mitochondria do not exhibit replicative segregation.
B) heteroplasmy is present.
C) both sperm and eggs contribute cytoplasm to the zygote.
D) there are multiple copies of mtDNA in each cell.