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A class collects ＄50 to buy flowers for a classmate who is in the hospital. Roses cost ＄3 each， and carnations cost ＄2 each. No other flowers are to be used. How many different bouquets could be purchased for exactly ＄50？_______
下列语句：
①M＝input(“How many heads”)；
②N＝input(“How many legs”)；
③A＝(4*M－N)/2；
④B＝M－A；
⑤A；
⑥print(％io(2)，B)．
其中是输出语句的是
A．①②
B．③④
C．⑤⑥
D．⑤