B. South Texas
due to the fact of the coastal area and the border which creates a economic Core Area
The answer for this is "Compromise of 1850".
The Compromise of 1850 is a set of laws dealing with the issue of slavery. California was admitted as a free state, upsetting the groups in favor of slavery and satisfying those opposing it in the U.S senate. In Addition, California abolished the slave trade by entering the Union as a free (no slavery) state.
The answer is C. With the industrial revolution came a surplus of immigrants which in return caused the population to skyrocket. More people = more food. So the correct answer should be C.