Question

1. what is a risk factor? a variable that cannot be controlled a variable that causes infectious disease a variable associated with getting a noninfectious disease a variable that a person is born with

Explanation:

A risk factor is a variable that increases the likelihood of developing a non - infectious disease. It doesn't necessarily cause the disease (so it's not like a direct cause as in "causes infectious disease"), it can be controlled (contrary to "a variable that cannot be controlled"), and it's not just something a person is born with (as some risk factors like lifestyle choices are acquired).

Answer:

a variable associated with getting a noninfectious disease