The minimum requirement from a male to make fertilization possible is

A) 400 million spermatocytes in at least 20 liters of seminal fluid.
B) 60 million spermatocytes in at least 250,000 milliliters of seminal fluid.
C) a million spermatocytes per 250,000 milliliters of seminal fluid.
D) 100,000 sperm in any volume of seminal fluid.
E) determined by the ethnic group of the man.
F) unknown.