Which of the following is an interrogative sentence?

a. where are you going?
b. don't go.
c. they questioned where he was going.
d. she isn't telling him where she is going

“you meet new people on a job. kayla morrison says, 'i work with two college students from the east coast, and it's been interesting learning about their lives.' kayla has also come to think of the café owner as a mentor who is providing her with valuable information about the food service industry. kayla is even thinking about applying for the culinary arts program at her high school.” what is the topic sentence of this paragraph?