Why did the population of Jamestown drop between 1609-1610?

"The Starving time"

Winter of 1609 - 1610 when food shortages, fractured leadership, and a siege by Powhatan Indian warriors killed two of every three colonists at James Fort.

i also think it is c

the option which was not a function of missionaries in the northwest was the first one - they established posts for trading furs and other goods.

missionaries were sent around the world to spread religion and their knowledge and others - they were not merchants who sold furs and other goods.