Which of the following is not a reason why communicable diseases, such as pneumonia, kill fewer people today than they did in the past?

Acontinuing medical advances

Bslower population growth

Cimproved living conditions

Dbetter preventive treatment user: if someone is predisposed to a disease, they are more likely to contract the disease due to __________.

Alifestyle choices

Bheredity

Crandom chance

Dfactors other than heredity or lifestyle