I think that the answer for "site" should be c. location.
Answer:
The moment of highest tension in the story was when Cameron had a look at her untidy room and thought that it would take forever to clean the room.
The moment was tensed when Cameron sat on her bed and looked at the piles of books on her desk, her unmade bed and her clean laundry in a basket at the door. She got sad and thought it will take forever for her to tidy the room which means that she couldn't go playing with her friends.
