Question

handwashing and taking vitamins can help us avoid

dread illnesses

viral illness

chronic illnesses

harmful illnesses

Explanation:

Hand - washing helps remove germs and taking vitamins can boost the immune system, which in turn helps avoid various harmful illnesses. While hand - washing and vitamins may have some benefits for certain types of illnesses like viral ones, "harmful illnesses" is the most general and appropriate term here as it encompasses all types of illnesses that can be avoided by these preventive measures.

Answer:

D. harmful illnesses