The nurse is caring for a client infected with methicillin-resistant Staphylococcus aureus (MRSA). What’s the major infection control measure to reduce MRSA and other nosocomial pathogens in a health care setting（）
A. Using antibacterial soap when bathing clients with MRSA.
B. Conducting culture surveys periodically.
C. Ensuring that personnel wash their hands before and after contact with every client.
D. Using specific housekeeping practices for environmental cleaning.