Which phrase best describes internment camps?

A prison camp for the confinement of prisoners of war, enemy aliens, political prisoners, etc. a concentration camp for civilian citizens, especially those with ties to an enemy during wartime, as the camps established by the United States government to detain Japanese Americans after the Pearl Harbor attacks.

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

explanation:

productive can also mean:

producing or giving rise torelating to or engaged in the production of goods, crops, or other commodities.

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