Question

the root fic or fac means do or make. what does the word prolific mean?
pushy or assertive
expressive or well - spoken
productive or fruitful
helpful or cooperative

Explanation:

The prefix "pro -" often means forward or forth. Combining with the root "fic/fac" (do or make), "prolific" implies making or doing a lot, which means productive or fruitful.

Answer:

productive or fruitful