Books are a great source _______ happiness.
- A. of
- B. for
- C. on
- D. with
Explanation
The fixed expression is “a source of happiness,” where “of” identifies what the source provides. The other prepositions do not form the standard collocation.
Explanation
The fixed expression is “a source of happiness,” where “of” identifies what the source provides. The other prepositions do not form the standard collocation.