We know that whales evolved from the same evolutionary ancestor as even-toed 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.