Select the option that represents the letters that, when sequentially placed from left to right in the blanks below, will complete the letter series.
A _ PL _ _ Z_LM_ _ PLMAZP_ _

Given: A _ PL _ _ Z_LM_ _ PLMAZP_ _

Option (a): MZAPAZLM

A M PL Z / A Z P LM / A Z PLM/ AZP L M

It is not logically following.

Option (b): ZMAPAZLM

A Z PL M / A Z P LM / A Z P LM / AZP L M

It is logically repeating pattern following.

Option (c): ZMPAAZLM

A Z PL M / P Z A LM / A Z PLM/ AZP L M

It is not logically following.

Option (d): MZPAAZML

A M PL Z / P  Z A LM / A Z PLM / AZP M L

It is not logically following.

Thus, the correct option is (b) ZMAPAZLM.