题目内容：
【单选题】The Delta Delta Delta Sorority held a homecoming party. The sorority prepared the following budget for 50 expected attendees:
Room rental $170
Food 250
Entertainment 150
Decorations 75
Totals $645
Afterall bills for the party were paid, the total came to $660. Details are: $140 for room rental; $320 forfood; $125 for entertainment; and $75 for decorations. Fifty persons attended the party.
Whatis the variance in hotel room rental?
A、$30 unfavorable is the hotel room rental variance.
B、$35 favorable is the hotel room rental variance.
C、$30 favorable is the hotel room rental variance.
D、$70 unfavorable is the hotel room rental variance.
参考答案：