Final answer:
The statement that best explains why this scenario represents a multifactorial disease is: 3) More than one factor caused the cancer.
Step-by-step explanation:
The scenario represents a multifactorial disease because more than one factor caused the cancer. Cancer is a complex disease that is caused by a combination of genetic and environmental factors. While some cancers can be caused by specific pathogens, the majority of cancers are not infectious and are caused by a variety of factors.
In this scenario, it is likely that the cancer was caused by multiple factors, such as environmental exposures and genetic predisposition. Therefore the correct answer is 3) More than one factor caused the cancer.