When rounding 56.78 to the nearest whole number, what is the result?

When rounding a number to the nearest whole number, you focus on the digit in the tenths place (the first digit to the right of the decimal point) to determine whether to round up or down.

In the case of 56.78, the whole number part is 56, and the digit in the tenths place is 7. According to rounding rules, if the tenths digit is 5 or greater, you round up. Since 7 is greater than 5, you round 56 up to the next whole number, which is 57.

Thus, rounding 56.78 results in the whole number 57. This aligns with the proper application of rounding rules, making it the correct choice.