The <em><u>correct answer</u></em> is:
3, 6, 7, 9
Explanation:
If your denominator was 1, you would have whole numbers, not repeating decimals.
If your denominator was 2, you would have halves. These do not repeat.
If your denominator was 4, you would have 0.25 or 0.75.
If your denominator was 5, you would have 0.2, 0.4, 0.6, or 0.8.
If your denominator was 8, you would have 0.125, 0.375, 0.625, or 0.875.
If your denominator was 10, you would have 0.1, 0.3, 0.7, or 0.9.
However, if your denominator is 3, you would have repeating 3's or 6's. If your denominator was 6, you would have a 1 with a repeating 6 or an 8 with repeating 3's. If your denominator was 7, you would have repeating 0.142857, repeating 0.285714, repeating 0.428571, repeating 0.571428, repeating 0.714285, or repeating 0.857142. If your denominator was 9, you would have repeating 1's, 2's, 4's, 5's, 7's, or 8's.