Well it isn't D and it has nothing to do with B even thought the Decoration involved and included slavery it isn't the main thing going on there.
Your answer is A
This is called multitasking.
Pls rate my answer if this helped.
If a proposition is true, then we say it has a truth value of "true"; if a proposition is false, its truth value is "false". For example, "Grass is green", and "2 + 5 = 5" are propositions.
hope this helps :)