Which of the following is true for the period from Independence to 186

Which of the following is true for the period from Independence to 1860?

(a) The system of indentured servitude died out because it was seen to be immoral and inconsistent with the Constitution.
(b) The system of slavery flourished because the relative price of slaves fell consistently.
(c) The system of wage labor flourished as immigrant labor poured into the newly opened western lands.
(d) European immigrants typically shunned agricultural labor as their ticket to the good life.

ANSWER

(b)