How Did Abraham Lincoln Argue About Slavery in His Debates

How did Abraham Lincoln argue about slavery in his debates with Stephen Douglas during the 1858 Senate race?

A) He favored abolishing slavery in all the states and territories.
B) He favored restricting slavery to the states where it was most profitable.
C) He favored restricting slavery to the states where the Constitution protected it.
D) He favored using popular sovereignty to decide the slavery issue in new territories.
E) He favored allowing slavery in newly acquired territories.