Explanation:

Let’s break this down step by step:

- Here’s the pattern with blanks:

b _ e _ d k _ _ c e m _ k k b c _ m _ k k

Let’s look at each option and try it out.

Option 1: c, k, k, b, d, e, d

Let’s fill them in:

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

This doesn’t fit the existing pattern—letters repeat in odd ways.

Option 2: c, m, k, b, d, e, d

Filled in:

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

This one creates a repeating pattern: "b c e m d k k". Looks consistent with the sequence.

Option 3: c, k, m, b, d, e, d

Filled in:

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

This doesn’t match the earlier part of the sequence.

Option 4: c, m, k, b, c, c, d

Filled in:

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

Extra ‘c’s break the prior pattern.

Bottom line:

Option 2 fits perfectly and creates a logical, consistent repeating pattern throughout the series.

Option 2 is clearly correct: c, m, k, b, d, e, d