Question

which positive lifestyle choice can reduce the risk of developing noncommunicable diseases? applying sunscreen using insect repellant washing hands frequently covering the mouth when sneezing

Explanation:

Non - communicable diseases (NCDs) are not spread from person to person. Applying sunscreen helps protect the skin from harmful ultraviolet (UV) rays. Prolonged exposure to UV rays is a major risk factor for skin cancer (a non - communicable disease).
Using insect repellant helps prevent insect - borne communicable diseases (like malaria, Zika virus). Washing hands frequently and covering the mouth when sneezing are preventive measures for communicable diseases (to prevent the spread of germs from one person to another).

Answer:

applying sunscreen