Which of the following is not an example of a barter arrangement?

A. A carpenter builds a fence for a farmer, instead of the farmer paying the builder $1,000 in cash for labor and materials, the farmer recompenses the carpenter with $1,000 worth of foodstuffs

B. A plumber fixes a bakers sink, for which the baker would normally have paid $100 for the service, instead, the baker gives the plumber $100 worth of his baked goods

C. A photographer agrees to photograph a dentist's wedding pictures in return for some dental work of equal value

D. A babysitting cooperative run by neighborhood parents