Question - What was the primary reason that English plantation owners in the Chesapeake Bay region adopted slavery so quickly?

What was the primary reason that English plantation owners in the Chesapeake Bay region adopted slavery so quickly? 

a) The need for laborers and the price of slaves.

b) The need for laborers and the disease rate of indentured servants. 

c) The lack of indentured servants and scarcity of women. 

d)The British already had trade relations with Spain to secure slaves from Africa.

Answer: 

a) The need for laborers and the price of slaves.