in which set are the numbers arranged in ascending order?

1: 0.000325, 0.00225, 0.00125, 0.00325
2: 3.25 × 10^−3, 2.25 × 10^−3, 3.25 × 10^−4, 1.25 × 10^−3
3: 3.25 × 10^−4, 1.25 × 10^−3, 2.25 × 10^−3, 3.25 × 10^−3
4: 0.00125, 0.00225, 0.000325, 0.00325

The numbers are arranged in ascending order in set 2: 3.25 × 10^−3, 2.25 × 10^−3, 3.25 × 10^−4, 1.25 × 10^−3.