Select the combination of letters that when sequentially placed in the blanks of the given series will complete the series. c k _ g k c _ t _ k _ k t g _ c k _ g k |
t, k, g, c, k, t t, k, g, c, c, t t, g, k, c, k, t t, k, c, g, k, t |
t, k, g, c, k, t |
c k t g k / c k t g k / c k t g k / c k t g k t , k , g , c , k , t |