Which of the following is an example of the third...

Câu hỏi: Which of the following is an example of the third form of cooperation as it is defined in the _____paragraph?

A A new business attempts to take customers away from an established company

B Two rival political parties temporarily work together to defeat a third party 

C Students form a study group so that all of them can improve their grades

D Members of a farming community share work and the food that they grow