Which of the following is the most serious effect of water pollution for humans?

a infectious diseases

b. algal blooms

toxic food chain effects

d low-oxygen water

A. infectious diseases

Explanation:

A. makes the most sense because humans can catch many diseases in contaminated water like typhoid, jaundice, malaria etc.

B. is incorrect because algal blooms are just harmless algae on the surface of the water

C. Toxic food chain effects can negatively affect us but humans can always switch to a more easily accessible diet

D. Low oxygen water can severely hurt fish and their ecosystems but the question asked what affect humans the most not marine life