The correct option is B 2-5 years
Diphtheria is a bacterial infection that spreads easily and occurs quickly. It mainly affects the nose and throat. It is transmitted from one person to another by respiratory droplets from coughing and sneezing especially in crowded condition. Children under 5 and adults over 60 years old are particularly at risk for contracting the infection those who aren't well nourished and who don't have up-to-date immunizations are also at risk.