The given question requires subtracting 1685 from 2432. When subtracting, we start from the rightmost digit and subtract each corresponding digit. In this case, we subtract 5 from 2, which gives us 7. Then we subtract 8 from 3, but since 3 is smaller than 8, we need to borrow from the next digit. So, we borrow 1 from the tens place, making it 2, and subtract 8 from 12, which gives us 4. Finally, we subtract 1 from 2, which gives us 1. Therefore, the correct answer is 747.