The Fugitive slave Act said that any black, with out without papers could be claimed my a slaveowner and forced by into slavery. And any person knowing the whereabouts of a runaway had to report them. This was hard because no matter how far North a slave escaped, they were never truly safe
Because of the lack of details ill give an answer to the best of my ability id say The unknown rebel at the 1989 Tianaman protests he stood by his morals by stepping in front of the tanks even if they were gonna run him over he was eventually packed into the back of a van never to be seen again the people he was friends with claimed to not know who he was or ever existed.
Basic reasons for exploration were industrial revolution, intellectual movement, reformation and expansion of missionary works,
The correct answer for this question is B.