How do you think Alison felt when she heard the knock at the door

A．We are not told.
B．He wanted to tell her how nice her flat was.
C．He wanted to introduce himself.
D．She had done something to offend him.

A．he had been an Army sergeant and had military ideas of discipline
B．he reported them to the Science masters whenever he caught them petty thieving
C．he was cruel
D．he believed in strict discipline