Explanation:

- Droplet infection: Tuberculosis (TB) spreads primarily through the air. When someone with TB sneezes, coughs, or speaks, they release tiny droplets containing the bacteria. Others can inhale these droplets and get infected. Correct Answer: Option 2 - Droplet infection

- Inoculation into skin: TB is not typically spread by inoculation or direct introduction of bacteria into the skin. This is more related to laboratory accidents or rare medical circumstances.

- Direct touching: TB bacteria don't usually survive well on surfaces or the skin. Touching a person or object isn't a common route of transmission.

- Contact with soil: TB does not spread through contact with soil. It's an airborne disease, and the bacteria primarily thrive within lungs.