Volpe's Understanding Evolution 7th Edition by Peter Rosenbaum

Exercise 10

The common ancestor of all human males has been traced using the Y-chromosome and the common ancestor, called Y-chromosome Adam, is seen as a group of men from whom all modern men are descended. Approximately how long ago does Y-chromosome data suggest that all human males had a common ancestor?
A) 1 million years ago
B) 600,000 years ago
C) 300,000 years ago
D) 150,000 years ago
E) 15,000 years ago.