When Neither the Northern nor the Southern Hemisphere Is Tilted $\circ$

Multiple Choice

When neither the Northern nor the Southern Hemisphere is tilted toward the sun,the noon sun's vertical rays are felt at

A) 23.5 ^$\circ$ north and south latitude.
B) the equator.
C) 67.5 ^$\circ$ north and south latitude.
D) the summer solstice.