Biology

Answer: C

Explanation:

Correct option: The kidneys are responsible for maintaining the body's fluid balance.
When they are diseased, they can't effectively filter and reabsorb fluids.
As a result, fluid accumulates in the interstitial spaces, leading to swelling (edema) in the legs and ankles.
So, option C is correct.

Incorrect options:

Option A: While excessive water intake can put a strain on the kidneys, it is not the main cause of swelling in kidney - disease patients.
The kidneys should be able to handle normal ...