Question

On a pay stub, what is the difference between "Net Pay" and YTD Net Pay"?

ANet Pay is how much you've made in a year, YTD Net Pay is how much is withheld for taxes.
BNet Pay is how much you've made during a pay period, YTD Net Pay is how much is withheld for taxes.
CNet Pay is how much you've made during a pay period, YTD Net Pay is how you've made this year.
DNet Pay is how much you've made minus taxes in one year, YTD Net Pay is how you've made in the last pay period.

Answer 1

The answer is "C". Your net pay is how much you've made during the pay period. 

Answer 2

The answer is "C". Your net pay is how much you've made during the pay period. Your YTD, or year-to-date net pay is how much you've made during the year. They have nothing to do with taxes.