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: Investing in hospitals .
Option 1: Real Estate .
Option 2: None of the above choices .
Option 3: Running a hospital .
Answer: 1