Which of the following sentences contains a posessive pronoun?

A. The dogs ate their food too quickly.

B. Thomas found the book and bought it. C. "When do you want to leave?" Pablo asked.

D. The teacher gave him extra credit.

A. The dogs ate their food too quickly.

Explanation:

The first sentence "the dogs ate their food too quickly" contains the possessive pronoun 'their'. this is because "their" signifies that the food which the dogs were meant to eat. As soon as their food was given to them they ate it. 'Their' is a possessive pronoun here because it replaces the noun that could have been used. Here it is also determining the ownership of the dogs for their food. This also shows that it belongs to someone in particular.