Final answer:
The sentence fragment in the given options is 'c. Two weeks from today.' as it lacks a verb and does not express a complete thought.
Step-by-step explanation:
The sentence fragment among the options provided is c. Two weeks from today. A complete sentence requires at least a subject and a verb to stand on its own. Option c is lacking a verb and does not form a complete thought. It is simply a phrase indicating a time frame, but it does not tell us what will happen or is happening two weeks from today.
In contrast, the other options:
- a. David plans to fly to Texas.
- b. He is going to leave after his math class.
Both include subjects ('David' and 'He') and verbs ('plans' and 'is going'), making them complete sentences that express a complete thought.