Explanation:

- Begin by interchanging the first and last digits of each number.

- 684 becomes 486.

- 145 becomes 541.

- 529 becomes 925.

- 574 becomes 475.

- 169 becomes 961.

- Now, identify the numbers based on the new values:

- 486

- 541

- 925

- 475

- 961

- Sort these numbers to find out which is the second highest:

- The sorted order is: 475, 486, 541, 925, 961.

- The second highest number is 925.

- Accordingly, the original number corresponding to 925 is 529.

- Correct Answer: Option:3, 529

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