Final answer:
The question is asking who held the chipped gray tile during the prank, but lacks specific details.
Step-by-step explanation:
In the given question, the students pranked Chet by holding a chipped gray tile that was supposed to be a shark fin. The question asks who held the tile during the prank. Unfortunately, without additional information, it is not possible to determine who specifically held the tile as the question lacks specific details. To answer the question accurately, it would be helpful to have more context.