Which answer is the sentence fragment? a. a 757 jumbo jet on the way home to burlington, vermont. b. mr. sharp's trip took him from vermont to tucson, arizona. c. they looked like a volcano oozing lava, he thought. d. at night, he said, he could see wildfires burning in the hills.

(A) A 757 jumbo jet on the way home to Burlington, Vermont   is the correct answer.

(B) (C) and (C) are all complete sentences because they correctly include a subject and a verb.

(A) is the fragment because there is no verb; the entire phrase is just describing the jet, but it doesn't say what the jet does. ("on the way home" is a phrase describing the status of the jet, not the action of the jet. The word "is" would have to come before "on" for it to be a complete sentence because "is" is a verb)

The bell is just a signal that the set time of the end of class is passing. the teacher lets you know when it's okay to leave.