Mitochondrial DNA Profiling Is Used to Trace the Maternal Side

Mitochondrial DNA profiling is used to trace the maternal side of family trees.Why is this done using mtDNA?

A) The mtDNA is supplied to the zygote only from the egg.
B) The mtDNA under low selective pressure mutates readily.
C) The mtDNA undergoes recombination allowing allelic mixture.
D) The mtDNA only comes from the father so all differences are from the mother.