to keep the eggs inside the nest to keep the eggs warm to protect the eggs from the wind to protect the eggs from the rain
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Most birds sit on their eggs until they hatch. Which of these is the most important reason why birds sit on their eggs?
Possibilities:
- to keep the eggs inside the nest
- to keep the eggs warm
- to protect the eggs from the wind
- to protect the eggs from the rain

to keep the eggs warm