Answer: B
Step-by-step explanation:
I know that when people get AIDS their immune system gets weaker, so I think it's right
A- makes their immune system better lol
B- Makes sense
C- That seems so wrong, although they do get weak, it happens over the course of weeks and months; maybe even years
D- You have to get HIV first then AIDS, but I'm not so sure, I still think B is right
Hope I helped