Which sentence is punctuated correctly?

A.
The rocket launches in 50 minutes, at 810 A.M.

B.
The alarm clock is set to wake me at 7:40 A.M.

C.
The sun will rise at 5;15 A.M.

D.
Is "a quarter after three" the same as 3.15?

Question

Which sentence is punctuated correctly?	
 
 A.
The rocket launches in 50 minutes, at 810 A.M.
 
 B.
The alarm clock is set to wake me at 7:40 A.M.
 
 C.
The sun will rise at 5;15 A.M.
 
 D.
Is "a quarter after three" the same as 3.15?

anonymous · Answer

B because the other ones have mistakes in separating the minutes from the hour.