The correct statement about the constitution of the Confederate States of America (CSA) is:
It stressed the independence of each state and guaranteed to protect slavery.
The Confederate Constitution emphasized state sovereignty and explicitly protected the institution of slavery. The other statements are not true regarding the CSA Constitution. For instance, it did not allow the importation of new slaves from other countries (which was actually prohibited), nor did it incorporate the Crittenden Compromise, and it did not call for reimbursement for unreturned fugitives like the earlier Compromise proposals.