Which of the Following Refers to the Process of Incubation

Which of the following refers to the process of incubation?

A) The negotiators create a new alternative that meets parties' underlying interests.
B) The negotiators align the issues in such a way that permits the issues to be negotiated independently and, ideally, traded off.
C) The negotiating teams agree to take a break and convene the next day to iron out a solution to their problem.
D) The rival negotiating teams each make one concession in return for securing approval for a contract.