I would say a. but not sure
They got more workers to build for them
Answer:
Rivalry
Explanation:
This can be seen from the beginning after WWII, the U.S.S.R. and the U.S.A. were competing with each other during the height of the Cold war for Ideological dominance in third world countries such as Korea, Vietnam, Afghanistan as well as Latin American guerrilla groups to name a few.
Answer:
Wind
Explanation:
Most conifers and about 12% of the world's flowering plants are wind-pollinated.