The Polarity of the Sun's Magnetic Field Reverses During a Sunspot

Multiple Choice

The polarity of the Sun's magnetic field reverses during a sunspot cycle. When does this reversal take place?

A) when the sunspot number is minimum, about every 11 years
B) when the sunspot number is minimum, about every 22 years
C) when the sunspot number is maximum, about every 11 years
D) when the sunspot number is maximum, about every 22 years