Pick your answer from: [I] summer end. [II] evaporation. [III] Winter. [IV] movement. [V] air cools. [VI] Wet weather. [VII] rainy. [VIII] dry and hot.
Given those answer options, answer the question: You are presented with the quiz "Fog is formed when" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "fog is formed by water vapor condensing in the air" and "when air cools, the water vapor in the air condenses."". So, what's the best answer to the question?
A:
[V]