M: You know I have just bought a new fully-automatic washing machine. When I bought it the salesgirl only showed me how to operate it. Now I cannot remember. W: You’d better read the instructions first. Pressing the buttons randomly may cause the machine to break down. Q: What does the woman suggest the man do?（）
A．He should press and try the buttons one by one. B．He should ask the salesgirl to show him how to operate it. C．He should read the user's operation manual first. D．He should try to remember what the salesgirl showed him.