Suppose After the Semester Ends, You Take a Trip to a Tropical

Suppose after the semester ends, you take a trip to a tropical island. Upon arriving at the island, you make a stop at one of the markets and notice that everyone is carrying around jars full of little turtles. You also notice the person in line in front of you just paid for a bottle of rum with 6 turtles. Someone else just bought a straw hat for two turtles. Thinking back to your economics class (as painful as that may be) , you would conclude that

A) this is a barter economy.
B) those little turtles are serving as money.
C) turtles are valueless.
D) turtle soup is a delicacy.