Explanation:

- Let's check each number after subtracting one:

1. 683 (684 - 1)

2. 144 (145 - 1)

3. 528 (529 - 1)

4. 573 (574 - 1)

5. 168 (169 - 1)

- Now, identify if any of these are perfect squares:

- 683 is not a perfect square.

- 144 is a perfect square (12 * 12).

- 528 is not a perfect square.

- 573 is not a perfect square.

- 168 is not a perfect square.

- 144 is the only perfect square among the modified numbers.

- Therefore, Option:1, One is the correct choice.

- Answer: Option 1 is correct.

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