Compared to the North Sea and Atlantic Ocean,with What Problem

Compared to the North Sea and Atlantic Ocean,with what problem must the Mediterranean,Baltic,and Black seas contend?

A) They have difficulty cleansing themselves of pollutants due to their location.
B) Their substantial oil and gas resources are being developed recklessly.
C) Each is shrinking because the main rivers that feed them have been diverted.
D) Freshwater animal life is being threatened by saltwater intrusion.