Sloths sleep up to 20 hours a day.
A
Correct answer
Explanation
Sloths are among the sleepiest animals on Earth, sleeping 15-20 hours per day in the wild. Their extremely slow metabolism and low-energy diet of leaves require extensive rest to conserve energy. In captivity, sloths have been observed sleeping even more - up to 20 hours - making them one of the longest-sleeping mammals.