For an Observer Standing on the Equator, Which of These

Multiple Choice

For an observer standing on the equator, which of these positions in the sky would pass directly over their head (i.e., through their zenith) ? See Figure 1-17.

A) position of the Sun at summer solstice
B) ecliptic pole, or the perpendicular to the direction of the ecliptic plane
C) north celestial pole, or the perpendicular to the direction of the celestial equator
D) vernal equinox, or the zero point of right ascension on the celestial equator