Explanation:

Let's break this pattern down step by step:

- The given series is: pq_dh_qmd_p_m_h_q_dh

- We need to spot a repeating block or relation. Let's parse it into visible mini-sequences.

- Even visually, there are repeats of "pq", "dh", "qmd", "p", "m", "h", "q", "dh".

- Mapping out the absent elements can help:

pq _ dh _ qmd _ p _ m _ h _ q _ dh

- If you insert option 1: m, p, h, q, d, p, m:

- It becomes: pqm dhp qmd h p m h q d h

- Check for any internal repeat or logic—are sequences or pair patterns maintained? Not really.

- Option 2: m, p, q, h, d, p, m:

- pqm dhp qmd q p m h d h

- Now the chunk "qmd" repeats, and letters better fit the likely intended pattern.

- Option 3 and 4 just don't align with visible series patterns and break flow.

- Looking for the segmental pattern and intended symmetry, option 2 is the best fit.

Correct Answer: Option 2 - m, p, q, h, d, p, m

What this means is: look for how each insertion either maintains or breaks the series rhythm. Option 2 fits the sequence style best, and keeps logical consistency.