We Know That Whales Evolved from the Same Evolutionary Ancestor

We know that whales evolved from the same evolutionary ancestor as hoofed animals like cows and hippopotamuses because ____________.

A) whales, cows, and hippopotamuses have the same DNA sequence
B) whales, cows, and hippopotamuses all exhibit an anklebone with a unique shape
C) scientists have been able to induce whale embryos to develop into cows in the laboratory
D) remnants of horns are obvious on the skulls of whales