Lincoln rejected the proposed Crittenden Compromise primarily because
a. it left open the possibility that slavery could expand south into Mexico, Central America, or the Caribbean.
b. it permitted the further extension of slavery north of the line of 36° 30?.
c. it represented essentially the continuation of Douglas's popular sovereignty doctrine.
d. the Supreme Court would probably have ruled it unconstitutional.
e. it would have restored a permanent equal balance of slave and free states within the Union.
Answer: A