A set of teams held a round-robin tournament in which every team played every other team exactly once. Every team won 10 games and lost 10 games; there were no ties. How many sets of three teams \{A, B, C\} were there in which A beat B, B beat C, and C beat A ?
Answer Choices
A. 385
B. 665
C. 945
D. 1140
E. 1330