Final answer:
The completion for the sentence about X-Ray's reward is b. 'a double shower, and clean clothes,' which is a detail from the book 'Holes' by Louis Sachar.
Step-by-step explanation:
The question references a scenario where X-Ray was rewarded for finding the gold tube. The correct completion of the sentence 'X-Ray was rewarded for finding the gold tube by a ride back to camp,________.' is b) a double shower, and clean clothes. This is a detail from the book 'Holes' by Louis Sachar, where the character named X-Ray receives these benefits as a reward after claiming to have found something special in the desert at Camp Green Lake. In the context of the story, these rewards are significant because the conditions at the camp are harsh, and any relief, such as a double shower and clean clothes, would be greatly appreciated by the campers.