Read the following sentences.

It seems as though you feel that one rotten apple spoils the barrel. Punishing everyone for someone else's mistake does not seem fair.

What is the meaning of the underlined phrase from the sentences above?
A.
The youth are troublesome.

B.
Everyone makes mistakes.

C.
Be just to others.

D.
A bad influence can bring down others.

D. A bad influence can bring down others.