Floods can cause humongous damage. They have incredible power and unpredictability. They can ruin everything including houses, buildings, roads etc. Floods leave mud and sand behind. It can take months to clean up after a flood.

What is the EFFECT?

A. Floods can cause a lot of damage
B. Floods happen in many areas without warning.
C. Floods are strong and unpredictable.
D. Flood damage is devastating

Answer: D

Solution:
The EFFECT in the given text is: “Flood damage is devastating.”

The text describes the consequences of floods, highlighting their incredible power and unpredictability, which can ruin everything including houses, buildings, roads, and leave mud and sand behind. The overall effect mentioned is that flood damage is devastating.