What time did they arrive . . . . . . . . the hotel? A. in B. on C. at D. to

The preposition “on” is used to indicate a date or day. For example, you might say that you arrived “on Monday” or “on the 1st of January.” However, in this case, the question is asking for a specific time, not a date or day. Therefore, the answer cannot be “on.”

The preposition “to” is used to indicate a destination. For example, you might say that you are going “to the store” or “to the airport.” However, in this case, the question is asking for the specific time that the people arrived at the hotel, not their destination. Therefore, the answer cannot be “to.”