C. Choose the TRUE sentence. 1) Only mother penguins keep their eggs warm. 2) Only father penguins keep their eggs warm. 3) Both male and female penguins keep their eggs warm.

В тексте сказано, что и самцы, и самки по очереди высиживают яйца (Male and female penguins take turns sitting on the eggs). Ответ: 3) Both male and female penguins keep their eggs warm.