Answer: true I think
Explanation:
they occupied below the Edwards Plateau to the Gulf coast
While all 3 of B, C, and D played some roll in their decisions, C and D are the only to possible ones in my eyes as secession was not a hot button issue until Carolina's calls for it. I'd reckon it's a 50-50 between C and D, so I'd choose D.
The answer im certain about is A and B im not so sure but im 89% sure B is right too