Mexico is building a stronger work force by
a. holding free elections
b. permitting
c. eliminating competition
d. investing in education

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; delirium is a common adverse reaction seen when elderly patients take diphenhydramine;

c. have a great