Assertion: An alternating current of frequency 50 Hz becomes zero 100 times in 1 second.
Reason: Alternating current changes direction and becomes zero twice in a cycle.

A) Both A and R are true, and R is the correct explanation of A.
B) Both A and R are true, but R is not the correct explanation of A.
C) A is true, but R is false.
D) A is false, but R is true.