Select the combination of letters that when sequentially placed in the blanks of the given series will complete the series.
b _ c e _ k b _ c _ f k b b _ e f _ b b c _ f k

A

b, e, b, f, c, k, e

B

b, f, b, e, c, k, e

C

b, f, b, c, e, k, e

D

b, f, b, e, c, e, k