"<span>D. camped" would correct the shift in tense in this sentence, since the first ver "traveled" is in the past tense, meaning that the next verb has to be in the past tense as well.</span>
It shows that there is a order, and the reader wont get mixed up from a bunch of commas, or a run on sentence.
Hope this helped !! :)
Lol depends on what is needed to be helped with.