Luis Being a College Student Has Undertaken Some Research

Multiple Choice

Luis being a college student has undertaken some research. The results have shown that people who buy expensive cars are less likely to die from a flu-related illness during the following year than those who do not buy. However, recent research has shown that people who buy expensive cars are also less likely to die from any cause during the following year than those who don't buy. Are there any confounding variables that make it difficult to justify a cause-and-effect conclusion? ​

A) No, there are no confounding variables that make it difficult to justify a cause-and-effect conclusion.
B) Genetic inheritance of a flu-related illness is the only confounding variable.
C) General health, home environment, socio-economic status, or wealth - are examples of possible confounding variables.
D) Addiction to buying expensive cars is the only confounding variable.