What were Senator John C. Calhoun’s views in the congressional debate

What were Senator John C. Calhoun’s views in the congressional debate in 1850?

A) There must be a constitutional amendment to protect southern rights to carry slaves into western territories.
B) Congress should extend the Missouri Compromise line to the Pacific Coast; banning slavery north of the line, but allowing it south of the line.
C) An unfavorable natural environment would make slavery unprofitable in the western territories.
D) Residents of each territory should decide for themselves whether theirs would be a free or slave territory.

ANSWER
A