EXPLANATION
Disconcert: to confuse, upset or embarrass somebody
A) Sing in harmony: to make musical sounds with the voice in the form of a song
or tune in a state of agreement in feelings, interests, opinions, etc
B) Pretend: to make oneself appear to be something or to be doing something in
order to deceive others or in play
C) Cancel program: to say that something in a series of instruction in code that
control the operation of a computer which has already been arranged and decided
upon will not be done or take place
D) Confuse: to make somebody unable to think well; to bewilder somebody
E) Interrupt: to stop the continuous progress of something temporary
THE CORRECT ANSWER IS (D)