Second person stories tend to make the reader a/an

A. distant watcher.

B. silent observer.

C. character in the book.

D. interactive reader.

I think the answer would be C

Second person refers to "you," rather than first person ("I") or third person ("he/she/it"). So a second person story would have the reader appearing in the story. "You were here, you did this." It's quite an unusual form of story but tends to make "you" the main character. The best answer is C.