Context: My mum wants to get rich which is why she got in to the property developing business . She has four properties all with a mortgage , one being the dream house my dad lives in , two she is renting out and the rent just covers the mortgage rates , and the fourth she lives in herself since splitting with my dad . Last year she was rushed to hospital with heart failure , now this was n't a clot that could be removed , this was something rare where her heart shrunk and would not pump .
Question: What drives the mother 's income levels ?
Option 0: Selling and renting properties .
Option 1: Investing in hospitals .
Option 2: Running a hospital .
Option 3: None of the above choices .
Answer: 0