Which of the following is a dependent clause?
a. While we were eating dinner.
b. After the disruption, we left.
c. We saw a group of people laughing.
d. People wearing tinfoil hats crowded the street.
A dependent clause is a clause that has a verb and a subject, but can't stay on it's own: this is the case in option a): you need to add a subordinate clause, such as "While we were eating dinner, the doll rang" - a is the correct answer.
