Which sentence contains a dependent clause?

i want to become an electrician.

i want to become an electrician after i graduate high school.

i want to go to college for electrical engineering.

i want to go to college and get a job.

Dependent clauses cannot stand on their own, they have to be parts of a bigger, complete, independent clause. Having that in mind, the correct answer is I want to become an electrician after I graduate high school. 
Here, the dependent clause is after I graduate high school, which doesn't sound complete, as you can see. The other options are simple sentences or contain two independent clauses, but there are no dependent ones.

Ait serves as a prompt for the interpretive literary analysis