Final answer:
A. Increased chance of infection. Suppressing the immune system increases the chance of infection.
Step-by-step explanation:
The effect of suppressing the immune system is an increased chance of infection. When the immune system is suppressed, it becomes less able to fight off pathogens like bacteria and viruses, making the person more susceptible to infections. This is especially important to consider in individuals with a weakened immune system, such as those with HIV/AIDS or those taking immunosuppressive drugs after an organ transplant.