Context: Read the passage about Nile crocodiles.
Nile crocodiles are big and scary. But they're also good parents! The mother crocodile lays her eggs in a hole in the sand. Then, for three months, she watches over them and keeps them safe. The father helps, too.
When the eggs are ready to hatch, the babies inside make special noises. This tells their mother to dig up the eggs. When the babies hatch, their mother carries them to the water in her mouth. Then, she takes care of them for about two years while they grow.
How long do Nile crocodile eggs stay buried in the sand?
A. three months
B. three days
From the given choices, select the correct answer and reply with the letter of the chosen option.

A