Concept:Tuberculosis (TB) is spread through the air by droplets from an infected person.Explanation:When an infected person coughs, sneezes, or talks, tiny droplets containing the TB bacteria are released into the air.A healthy person can breathe in these infected droplets and become infected.This means TB is transmitted through the air, not by food, handshakes, or syringes.Answer:B. when an infected person coughs openly into the air.