Volpe's Understanding Evolution 7th Edition by Peter Rosenbaum

Exercise 9

Mitochondria is maternally inherited and is thus past along the female lineage. Based on mitochondrial DNA analysis, all humans females alive today have a common ancestor or group of individual (sometimes referred to as "mitochondrial Eve") from which all modern females are descended that lived roughly
A) 1 million years ago
B) 500,000 years ago
C) 200,000 years ago
D) 50,000 years ago
E) 20,000 years ago.