An Intervention on the Part of a Nursing Instructor Would

An intervention on the part of a nursing instructor would be required in which situation?

A) A student dons a gown and gloves before entering the room of a client on contact precautions.
B) A student ties the lower strings of a mask up on the head.
C) A student performs hand washing immediately after removing his or her gloves.
D) A student performs hand washing before touching the tubes connected to a client.