The answer would be true the phrase alone can be a sentence
Answer:
D) I tried to drive before the light turned red, but stopped when it did
E) I tried to drive when the light was still yellow, but stopped when it turned red.
Explanation:
Given the fact that the question is incomplete and example 2 (which is said to be a garbled sentence, confusingly written) was not given, we can assume that it was talking about a person trying to beat the red light.
With this in mind, the two revisions below that would clarify its meaning are options D and E because they make the most sense.