It's Lina's Bedtime

It's Lina's bedtime.After she heads upstairs,she peeks her head out and asks her mom for "just one more story." Her mom says,"OK,just this once. " Lina picks a long story and ends up in bed a half-hour later than normal.Which of the following best applies to this scenario?

A) Lina has been negatively reinforced and is more likely to request additional stories on subsequent nights.
B) Lina has been positively reinforced and is more likely to request additional stories on subsequent nights.
C) Lina's mom has been positively reinforced and is more likely to read additional stories on subsequent nights.
D) Lina's delayed bedtime, if continued, is unlikely to have any effect on her sleep quality, since the delay was relatively short.