A Cafeteria Worker Who Fails to Wash His Hands Thoroughly

Multiple Choice

A cafeteria worker who fails to wash his hands thoroughly and fails to wear gloves inoculates a quiche with four E. coli cells when he uses his finger to test whether it is done. By the time you purchase the quiche, there are 128 E. coli cells in it. How many generations did the cells go through?

A) 4
B) 5
C) 8
D) 32
E) 64