Explanation:

Let’s break this down step by step.

Here’s the sequence:

PQR_, PQ_S, P_RS, _QRS

- Each term is a 4-letter sequence, but one letter is missing every time.

- If you look closely, the missing letter shifts one position to the right each time.

Check each box:

- PQR_: the last (4th) letter is missing

- PQ_S: the 3rd letter is missing

- P_RS: the 2nd letter is missing

- _QRS: the 1st letter is missing

Fill in the blanks in order:

1. First term: PQR_ — letter missing = S ? PQRS

2. Second term: PQ_S — letter missing = R ? PQRS

3. Third term: P_RS — letter missing = Q ? PQRS

4. Fourth term: _QRS — letter missing = P ? PQRS

So, from right to left, the missing letters are: S, R, Q, P

Now, the options—read them as the sequence of missing letters:

1. SRQP

2. SQRP

3. SRPQ

4. RSPQ

- We want the series of missing letters: S, R, Q, P

Here’s the thing:

- Option 1: SRQP (matches the order exactly)

- Option 2: SQRP (the Q is in the wrong spot)

- Option 3: SRPQ (the Q and P are swapped)

- Option 4: RSPQ (completely different order)

So, the correct answer is Option 1: SRQP.