What was john brown’s goal in his raid on harper’s ferry? a) he hoped to retrieve his runaway slaves. b) he wanted to confiscate u. s. marines' supplies for his own men. c) he wanted to start an armed slave revolt to abolition causes. d) he wanted control over harper's ferry because for waterway access.

C. He wanted to start an armed slave revolt to help abolition causes

 C) He wanted to start an armed slave revolt to help abolition causes.

Further explanation:

John Brown (1800-1859) was an abolitionist who supported armed struggle against existing laws and government in order to end slavery.  In October 1859, Brown led a raid on the federal armory at Harpers Ferry, Virginia.  The intent was to arm slaves to fight for their freedom and set in motion a slave revolt that would spread across other regions in the South.  The effort was unsuccessful and Brown was hanged for treason against Virginia.