Explanation:

To identify the pattern in the series, let's examine each step:

- PERSONA: This is the original word.

- ANPERSO: The last two letters 'NA' move to the front.

- ANOSPER: The last two letters 'SO' move to the front.

- ?: Following the same pattern, the last two letters 'ER' from ANOSPER should move to the front, resulting in ANOSERP.

Now, let's verify the options:

1. ANOSERP: Matches the pattern perfectly.

2. NOSAREP: Does not follow the shifting pattern.

3. ANSORPE: Incorrect order according to pattern progression.

4. ANOSREP: Incorrect order according to the pattern.

Your selected option was Option 4: ANOSREP.

. The correct answer is Option 1: ANOSERP.