Why can’t the woman go with the man

A．She doesn’t want to practise any more.
B．They’ve been dancing since six o’clock.
C．The dance routine needs more right turns.
D．She will be ready to practise at six o’clock.

A．To demonstrate the latest use of computer graphics.
B．To raise funds for public television programming.
C．To explain the working of human brain.
D．To increase membership in professional medical societies.