It's either A or C if you need more information on why just ask it's kinda weird to explain
One mechanism could be educating people about HIV/AIDS from mouth to mouth, another would be to make long lectures which would educate people about this disease, another would be to make workshops which would serve the same role.
Umm, its bad I think.
Lack of sleep can lead to many diseases and problems. Sleep is one of the basic requirement like food, water and air.
Answer:
It usually takes around 4-10 days for a virus to enter a cell.
Explanation:
I hope this helps :)