"Who" is the correct answer to this question. Since you are referring to the student who receives the award, the correct choice would be "who". It cannot be whom, which or that because the sentence is not referring to an object.
"<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>
