They parked their car . . . . . . . . a parking place. A. to B. at C. on D. in

The correct answer is: B. at

The preposition “at” is used to indicate a specific location or position. In this case, the car is parked at a specific location, which is a parking place.

The other prepositions are not correct in this context. The preposition “to” is used to indicate a destination or goal. The preposition “on” is used to indicate a surface or area. The preposition “in” is used to indicate a container or enclosed space.

Here are some examples of how the other prepositions can be used:

• I drove to the store.
• The book is on the table.
• The cat is in the box.