She is so optimistic that her cheerful spirits and bubbling laughter _____ the whole class.

She is so optimistic that her cheerful spirits and bubbling laughter _____ the whole class.

1. A.
   effect
2. B.
   effected
3. C.
   infected
4. D.
   infect

She is so optimistic that her cheerful spirits and bubbling laughter _____ the whole class.

A. effect                    B. effected           C. infected                D. infect

She is so optimistic that her cheerful spirits and bubbling laughter _____ the whole class.