Question

esto se refiere a un día en el que uno de los polos apunta más directamente al sol.
a equinoccio
b solsticio
c verano
d invierno

Explanation:

The question is about a day when one of the Earth's poles points most directly at the Sun. A solstice (Solsticio) occurs when one of the Earth's poles is tilted most directly toward or away from the Sun. Equinox (Equinoccio) is when the Sun is directly over the equator, so poles aren't pointed most directly. Verano (Summer) and Invierno (Winter) are seasons, not the specific astronomical event of a pole pointing most directly at the Sun. So the correct option is b.

Answer:

b. Solsticio