Question

What are the name of (B) and (C) ?

Answer 1

Please see below.

Explanation:

I've never heard of names for these.

The distance `B` is twice (two times) the period. The part of the graph between the ends of `B` is two periods.

The distance `C` is half the period. The part of the graph between the ends of `C` is half a period, which is `1/2 xx` Period.