Question 1
By what routes are sexually transmitted diseases passed from one person to another?
The right answer is the one marked above.
Sexual contact, sexual secretions reaching the sexual organs, and infected blood entering the body. About 20 such diseases have been identified so far.
The other three are the beliefs that cause people living with these infections to be treated badly, and none of them transmits anything. Knowing the real routes matters for that reason as much as for avoiding infection.