C. When she entered the pet shelter, Sarah met --- 1) the mayor of the town. 2) her friends from the park 3) the shelter's owner 4) a group of volunteers.

The text states, "As she waved goodbye to Mrs. Thompson and Max..." Mrs. Thompson is identified as a person Sarah interacted with at the shelter, and likely the owner or a staff member. When Sarah enters the pet shelter, it's implied she interacts with the people there. Given the options, and the mention of Mrs. Thompson, the most fitting answer is that she met the shelter's owner or someone associated with it.

Answer: 3) the shelter's owner