1. True
As long as you don't get any fluid that contains the virus in your body it will reduce the chance of getting HIV abstinence and condoms are one of the many ways you could reduce the risk.
2. False
There are no external symptoms of HIV so there is no possible way you could tell someone had HIV just by looking at them.
3. B. antiretroviral therapy
It does this by suppressing the virus in the blood to undetectable levels. It is important for the person to follow their therapy plan precisely.