D. People can still walk up the stairs to one of the bell towers and take in an amazing view of the city.
Explanation:
This is actually very easy, check it out: Answers B and C have citations included at the end of the material ("Patel 65"), meaning that those sentences have properly displayed a source for the content they incorporate. So, they are not plagiarized. And answer A is a completely unique sentence that takes no words from the exemplified text. Answer D however, takes text directly from the example almost word-for-word without a source citation. Though the author attempted to switch out the word "astonishing" for "amazing," that is one difference of three minimum to avoid plagiarism. So, it has been plagiarized.
