Astronomers Speak of a 22-Year Solar Sunspot Cycle Because It

Multiple Choice

Astronomers speak of a 22-year solar sunspot cycle because it is the time it takes

A) to go from sunspot minimum to sunspot maximum.
B) to go from one sunspot maximum to the next sunspot maximum.
C) to go from one sunspot minimum to the next sunspot minimum.
D) the Sun's magnetic pattern to repeat itself,which equals two sunspot cycles.