The main reasons for migration in Sub-Saharan Africa are: (Push & Pull Factors) Environmental Changes
Economic Pressure
Religious and Political Pressures or
All of the Above

answer; /// i do believe that the correct answer is (d) cooperative play; /// good luck

answer; self-efficacy;

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.