Which of the Following Is True

Which of the following is true?

A) When resources are allocated on the basis of personal characteristics, all people who are willing and able to pay the price get the resource.
B) When the range of activities to be monitored is large and complex, a command system allocates resources better than a market price.
C) When a market price allocates resources, some people who are willing and able to pay that price don't get the resource.
D) Force helps support the legal system on which markets function.