Six boys live together in an apartment, which has two bathrooms. Each morning from 7:00, They use both of the bathrooms before breakfast whereby they are 8, 10, 12, 17, 21, and 22 minutes respectively, constantly alone in one of the two bathrooms. What is the earliest time that all six boys can have breakfast together?
(A) 7:45
(B) 7:46
(C) 7:47
(D) 7:48
(E) 7:50