Q: Which of the following helped stabilize the economy of the Virginia colony?

Tobacco was the cash crop that stabilized Jamestown's economy, yet it required cheap labor, which eventually led to the import of enslaved Africans by Dutch traders. Jamestown colonist John Rolfe began growing tobacco in 1612. ... By 1619 Jamestown was a one-crop economy and a boon to the colony.

Explanation:

b). (sounds as the best answer)

john locke studied medicine and he laid a lot of groundwork for the enlightenment he also contibutied to the development of liberalism