Question

what do unprotected sex, having multiple sexual partners, and intravenous drug use have in common?
o they are all illegal.
o they are activities that are good for a healthy body.
o they are activities that only young people engage in.
o they are high - risk activities that put you at risk of infection.

Explanation:

Unprotected sex and having multiple sexual partners can transmit sexually - transmitted infections. Intravenous drug use with shared needles can transmit blood - borne infections like HIV and hepatitis. These are high - risk activities for infection.

Answer:

They are high - risk activities that put you at risk of infection.