Answer: A. There's limited wealth in the world.
Step-by-step explanation:
Mercantilism was based on the notion that there was limited wealth in the world so countries needed to accumulated as much of it as possible.
For this reason, countries imposed high customs duties on imports from other countries so that people would not buy them and send money to their countries. At the same time they tried to export more so that countries would give them more of the wealth in the world.