What is the world’s largest living mammal ?

What is the world’s largest living mammal ?

A. Elephant
B. Blue Whale
C. Shark
D. Giraffe

The blue whale is a marine mammal belonging to the suborder of baleen whales. At 30 metres (98 ft) in length and 180 metric tons (200 short tons) or more in weight, it is the largest known animal to have ever existed