The average of twelve numbers is 38. The average of the first three numbers is 33, that of the next four numbers is $$35\frac{1}{2}$$, and that of the next two numbers is 40. If the tenth number is less than the eleventh and twelfth numbers by 4 and 5, respectively, then the twelfth number is:

A

40

B

47

C

49

D

45