This Marine Mammal: A) Are Small Mammals with Dense Fur and Lack an Fur

This marine mammal:

A) are small mammals with dense fur and lack an insulating blubber layer.
B) are tropical herbivores found in shallow coastal waters.
C) have anterior flippers covered with hair that cannot be rotated backwards.
D) have posterior flippers than can be moved forward.
E) have thick fur with hollow fur shafts for insulation.