Which type of exchange occurs between the neighbors in this story?

Doug's neighbor Jake approaches him and asks if he can borrow his lawn mower. Though he didn't know him all that well, Doug decides to lend the mower to Jake. Later on, Doug finds himself lending equipment to his neighbors Janet and Lee, too. The next day, Dough needed to borrow some other lawn equipment, but his neighbors say, without explanation, that they are unable to lend him the equipment, causing him to become a bit perturbed. However, Doug starts to feel much better at the community association meeting, where his neighbors publicly honor him for his continual help in the neighborhood. The next order of business is choosing a new community association president.

A) obvious exchanges
B) indirect exchanges
C) incomplete exchanges
D) abstract exchanges

Answer: B