What three ratios are equivalent to 3/9?

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2 points
1/3, 2/3, 3/3
1/3, 12/36, 15/45
6/9, 12/15, 18/21
5/12, 9/12, 3/12

The three ratios that are equivalent to 3/9 are:

1/3, 2/3, 3/3