Everyone in Masonville Is Permitted to Use the Basketball Courts

Multiple Choice

Everyone in Masonville is permitted to use the basketball courts each day. However, no children under 12 are allowed to use the courts between noon and 3 PM, the hours of 3 PM to 6 PM are reserved for those over 55, and finally, after 6 PM the courts are reserved for teens aged 12 to 20.
If all of the sentences above are true, which of the following must also be true?

A) The majority of people in Masonville do not have small children.
B) No one in Masonville has a child under 12.
C) The courts are most popular after 6 PM.
D) The courts are in use everyday.
E) A 15 year old can use the courts anytime except for between 3 PM and 6 PM.