If you wanted to reduce your risk of contracting a communicable disease you could a. take steps to reduce your immune health b. avoid touching your shoes or clothing c. wash your hands often d. start smoking

The correct answer is C. wash your hands often

Explanation:

We make use of our hands in doing most of the work so our hand touches many surfaces every day that is why our hands have lots of microbes and bacteria which can go inside our body through food if we do not wash our hands before having meals and can cause illness.

We should wash our hands regularly to reduce the risk of contracting communicable diseases because washing hands can reduce the amount of microbes on our hand by more than 50%.  

So after doing any work in which our hands touches many surface which are not clean we should wash our hands with soap properly so that we do not get ill by communicable disease. So the right answer is C.