Which event led up to the korean war? a. south koreans invaded communist north korea
b. communist north koreans invaded south korea c. the united states and its allies invaded communist south korea d. communist chinese forces invaded south korea

its b also if you need more explaning theres a rllly funny you tube vid called oversimplified cold war part 1 that explans the korean war and also all the stuff you might need to know tell me if you wached it and if you liked it pls

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.