Which evidence in the passage best supports the inference that there is mystery behind the design of the leaning tower?

neither history or tradition say whether it was built as it is, purposely, or whether one of its sides has settled.

Explanation:

In 2081, everyone is equal not only in the eyes of the law but in every way; nobody is smarter, more athletic, better looking, etc. than anyone else. hazel is of average intelligence, which means she can't think about anything except in short bursts, and george has an intelligence way above normal.

Dshould be the answer