Social Entrepreneurs Embrace the Concept of "Co-Opetition", but What Does

Social entrepreneurs embrace the concept of "co-opetition", but what does "co-opetition" mean?

A) It only makes sense to compete with other social entrepreneurs and never to collaborate
B) Much of the time it makes sense to compete with other social entrepreneurs whereas sometimes they must collaborate with other social entrepreneurs
C) Much of the time it makes sense to collaborate with other social entrepreneurs whereas sometimes they must compete with other social entrepreneurs
D) It only makes sense to collaborate with other social entrepreneurs and never to compete