Correct Option: D

Births in elephants tend to take place during the rains. Calves are born 85 cm (33 in) tall and weigh around 120 kg (260 lb). The sperm whale produces the largest baby that weighs about 1 ton at birth. The newborn can instinctively swim for the first 10 seconds with help from its mother and swim alone within 30 minutes after birth. When baby blue whales are first born, they weigh over 3,000 kg (3 tones), about the same weight as a fully grown hippopotamus. Once born, a baby blue whale takes two years to reach a weight of 26,000 kg (26 tones). No other living creature grows so quickly.