In a row of boys facing the north, A is $$16^{th}$$ from the left and C is $$16^{th}$$ from the right end. B who is $$4^{th}$$ to the right of A, is $$5^{th}$$ to the left of C in the row. How many boys are there in the row ?

A

39

B

40

C

38

D

42