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

c, k, k, b, d, e, d c, m, k, b, d, e, d c, k, m, b, d, e, d c, m, k, b, c, c, d

c, m, k, b, d, e, d

k b c e m d k / k b c e m d k / k b c e m d k c, m, k, b, d, e, d