Where Would an Observer Have to Be in Either the Northern

Multiple Choice

Where would an observer have to be in either the northern or southern hemisphere for the Sun to remain below the horizon for a 24-hour period for at least part of a year?

A) Nowhere, because the Sun is always visible at some time of the day everywhere on Earth
B) above about 66.5° latitude
C) above about 23.5° latitude
D) only at 90°, or exactly at the poles