She graduated ______ an American college. A. for B. from C. in D. of

The correct preposition here is "from" because when discussing completion of studies at an educational institution, the standard collocation is "graduate from." This phrase specifically indicates the source or institution where one completed their education.

B. from

"She graduated from an American college."

This preposition choice follows the established grammatical pattern for describing educational attainment. Other options don't fit: "for" suggests purpose, "in" indicates location without completion, and "of" implies possession rather than attendance or completion. Native speakers instinctively use "graduate from" when referring to earning a degree from a specific institution.