Q: You are presented with the quiz "When does haze get denser?" 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 "the hotter the water, the denser the fog will be". So, what's the best answer to the question?

Available options:
[I] daylight changes;
[II] cloudy and rainy weather;
[III] reflect objectstowards the eye;
[IV] colder weather;
[V] colder and wetter;
[VI] at or near the margins;
[VII] When the water is hot;
[VIII] flow of electrons;
A:
[VII]