单项选择题

Questions 11-13 are based on the following monologue introducing American holidays. You now have 15 seconds to read Questions 11-13. Why is February named "Black History Month"

A.Because it is the month when slavery was abolished.
B.Because it is the time to honor blacks who make contributions to American culture.
C.Because some blacks were elected mayors in February.
D.Because there are programs for black people.