If the supplies on hand at the end of January totaled 300$ and the supplies on hand account before adjustment is $900, what should be an adjustment at month-end?

1. Increase supplies on hand by $900, reduce supplies expense by 900

2. Reduce supplies on hand by $600, increase supplies expense by 600

3. Reduce supplies on hand by $300, increase supplies expense by 300

4. Increase supplies on hand by $300, reduce supplies expense by 300