Fresh water is a limited resource because a. most water is polluted.
b. most surface water contains salt.
c. it is controlled by powerful governments.
d. dams have limited the flow of fresh water.

I think B

Explanation:

B: most surface water contains salt

Explanation:

if it contains salt that means you can;t drink it which LIMITS fresh water

b. inflammation of the brain

Explanation:

Main characteristic of encephalitis is inflammation of the brain. If you breakdown the word it translates to encephalo- which means the brain & -itis  means inflammation.