If an Intravenous Drug Abuser Should Attempt to Clean the "Rig

If an intravenous drug abuser should attempt to clean the "rig" by rinsing it out with tap water,

A) this can result in bacterial contamination of the needle since tap water can contain microorganisms.
B) this will move the bacterial contaminants to the tip of the needle, making the next user of that needle more likely to become infected.
C) this will cause the most vulnerable bacteria to die by exposing them to the chlorine in the tap water, leaving the more virulent strains behind to infect the next user.
D) the water itself will encourage the growth of microorganisms.