Fact 1: Awarm front causes cloudy and rainy weather. Fact 2: If warm air is advancing on cold air, the front is designated a warm front. Given the two facts above, what is a result when warm air advances on cold air?

Choices:
a). heat.
b). dry air.
c). blue skies.
d). rain.
e). storms.
f). drought.
g). Injury.
h). force.
The answer is:
d).