单项选择题

某酒店,一共有100间客房,卖掉10间过夜房(Stayover),酒店目前有N间房处于OO(Out of Order),M间处于OS(Out of Services)。酒店当前出租率是()

A.10/100
B.10/(100-M)
C.10/(100-N-M)
D.10/(100-N)