Answer:
1 - Two or three miles down the highway at the traffic light.
Step-by-step explanation:
Sentences need a subject, verb, and object. #1 has no verb, making it a sentence fragment :) .
The other option which presents itself as a best answer is #4. While it seems vague and like it may not have a subject, "the agreement" is the subject, "explained" is the verb, and "this" is the object. good luck!