Which of the following is a method by which infections can spread?

Droplet contact from coughing and sneezing is indeed a primary method by which infections can spread. When a person coughs or sneezes, tiny droplets containing pathogens can be propelled into the air and may land on individuals nearby or on surfaces. This transmission route is significant for respiratory infections, such as the flu or COVID-19, since the pathogens can enter the body through mucous membranes in the mouth, nose, or eyes of another person who inhales these droplets.

In contrast, physical exercise contributes to overall health and immunity but does not itself facilitate the spread of infections. Consuming healthy foods is important for maintaining a strong immune system, helping to prevent infections rather than spreading them. Regular hand washing is a crucial preventive measure to help stop the spread of infections, but it is a method of protection against transmission rather than a means of spreading infection itself.