Final answer:
The correct answer is B. Isolation. Infection can spread between patients through airborne transmission, direct contact, and droplet transmission.
Step-by-step explanation:
The correct answer is B. Isolation. Infection can spread between patients through three main routes: airborne transmission, direct contact, and droplet transmission. Airborne transmission occurs when pathogens in droplets are expelled from an infected person's respiratory system and inhaled by nearby people. Direct contact happens when there is skin-to-skin contact or when people touch the same surfaces. Droplet transmission occurs when pathogens are expelled from an infected person's respiratory system and land within a short distance of another person.