Emperor penguins weigh 1) more than a hundred kilograms. 2) less than thirteen kilograms. 3) about forty kilograms.

Решение:

• В тексте указано: "Emperors are the biggest penguins. They are about 120 cm tall (about the height of a six-year-old child) and weigh about 40 kg."

Ответ: 3) about forty kilograms.