The correct answer is C. They sent him to Canada on the Underground Railroad.
Explanation
During the mid-nineteenth century, there was an internal division in the United States among its citizens, while large majorities in the South agreed with slavery, in the northern areas the defense of anti-slavery had become popular. In the year 1850, the United States Senate passed a law on the treatment of runaway slaves, which established that runaway trapped slaves would be returned to their masters. In this context, Shadrach Minkins, an African American fugitive slave who was captured by bailiffs from Boston, was finally released from a courtroom in Boston by a group of abolitionists who, in addition to freeing him, helped him to reach Canada by the Underground Railroad. So, the correct answer is C.