Answer:
Step-by-step explanation:
My choice would be chronological. Yes the slaves were freed, but that only created another problem that the plantation owners had to solve. They still needed cheap labor. So you are moving from one event to the next.
The second choice is not true. The slaves, in 1833, had already been freed. There was a side effect. The plantation owners needed labor. That last event has nothing to do with why the slaves were freed.
There was only 1 nation that was discussed and that was Great Britain. They solved one problem only to create another that was almost as bad.
There's no mention of factories. This answer won't work.