Correct Answer: ppppqpq

Solution : Given:
pp _ _ qp _ pqq _ pqq _ _ qq _ q

To fill the series we have to divide the series – pp_ _q / p_pqq / _pqq_ / _qq_q
Let's check the options –
First option: pqpqpqp; pp pq q / p p pqq / q pqq p / q qq p q (No repeated pattern has been found.)
Second option: ppppqpq; pp p p q / p p pqq / p pqq q / p qq q q (The pattern in the series is that p decreases by 1 and q increases by 1 when moving from one part to another.)
Third option: qqpqpqp; pp q q q / p p pqq / q pqq p / q qq p q (No repeated pattern has been found.)
Fourth option: qqqpppq; pp q q q / p q pqq / p pqq p / p qq q q (No repeated pattern has been found.)

So, the series becomes→ppppqpppqqppqqqpqqqq. Hence, the second option is correct.