The question is properly written. This is how to solve it:

The difference between odd integers is always even. If a – b > 7, then the least possible positive difference between a and b is 8. Since b is odd, the largest even number less than b must be b – 1. So the least possible positive difference between a and b – 1 is 8 + 1, or 9.

The correct answer is D. An alternate strategy is to pick numbers: Let’s pick some numbers for a and b, minimizing the difference between them.

Suppose a = 11 and b = 3. Since 2 is the even number 1 less than 3, we are looking for the difference between 11 and 2, which is 9. Again, the correct answer is D.

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