Explanation:

Let’s break it down step by step:

- First, let's see what the rule is:

  *For every odd digit, subtract 1. For every even digit, add 1.*

- Let’s change each number:

   - 369: 3?2 (odd), 6?7 (even), 9?8 (odd) ? 278

   - 717: 7?6, 1?0, 7?6 ? 606

   - 922: 9?8, 2?3, 2?3 ? 833

   - 625: 6?7, 2?3, 5?4 ? 734

   - 434: 4?5, 3?2, 4?5 ? 525

- Now, let's spot the highest new number:

  833 is the biggest.

- Difference between the third digit and first digit of 833:

  3rd digit = 3, 1st digit = 8

  Difference = 3 - 8 = -5 (but they want positive, so let's use the absolute value)

  Difference = 5

- Now, let's check the options:

  1. Zero

  2. 6

  3. 4

  4. 2

  5. 5 

So the correct answer is Option 5: 5.