One major cause of floods is
a. rapid spring snowmelt.
b. light rain over a large area.
c. a decrease in stream discharge.
d. increased capacity of stream channels.

The correct answer is A. rapid spring snowmelt. When the spring times come, sometimes there's a lot of warmth that suddenly comes, especially nowadays when there's things such as global warming. So the snow melts and large amounts of water can flood the fields that are often found at the foot of a mountain or similar things.

Wish i knew this to !