Option B is correct because Asthma (ii) and Diabetes (iii) are non-communicable diseases. As stated in the chapter, non-communicable diseases like diabetes, asthma, and cancer are not caused by pathogens and do not spread from person to person. They are linked to lifestyle, diet, and environmental factors. Typhoid (i) is a bacterial infection spread through contaminated water and food, making it communicable. Measles (iv) is a viral disease spread through air, also communicable.