The answer is:
They were enslaved in the South.
Okay so other ways to produce energy would be (just throwing out a few )
1 . Gum
2. Light (light wakes up your brain a proven fact)
3. Massage your ears (im serious it boost energy its proven)
4. Eat something whole grain
5. Listening to your favorite song
(Im serious for all these answers)
Hope I helped (:
They based their laws on english customs. the answer is b