Read the following text and choose the correct answer.

The monkey used to give the crocodile an apple every day from the tree he lived on. The crocodile’s wife became greedy and asked for the monkey’s heart. The crocodile carried the monkey on its back to his wife. Once the monkey realized what was happening, he told the crocodile that his heart was on the tree and they had to return to fetch it. Once they returned, the monkey climbed onto the bank and ran away.

Source: parenting.firstcry.com

What was the story about?