en-year-old Stanley knows that his friend MaryAnn is angry because he played with Chester at recess. The next day, Stanley invites MaryAnn to play with Chester and him. Stanley is using .

i have to go with a for this one

productive most commonly means: achieving or producing a significant amount or result.

explanation:

productive can also mean:

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.

answer; an active listener;