The Following Questions Refer to the Excerpt Below

The following questions refer to the excerpt below.
"Run away from the Subscriber,the First of January,twelve Months past,a Negro Man,named Cato,who has since his Elopement changed his Name several times: Had on when he went away,a Pair of Buckskin Breeches,fine brown Linen Shirt…Underneath his right shoulder Blade he was branded in Jamaica when a Boy with the letters BC,which are plain to be seen…It is supposed he has a forged Pass."
Runaway slave notice,Pennsylvania Gazette,August 11,1757
-One reason for the development of the labor system described above was

A) violent confrontations between colonists and the British government.
B) the declining interest in using African slaves for industrial work.
C) the abundance of indentured servants in the British colonies.
D) the abundance of land resources in the British colonies.