Context: This is the first time that Paul and I have n't coordinated spare keys for whoever 's car ends up at the airport when we 're both away . So I could n't drive his car home when I got home today . So rather than spend $ 30 on a cab , I spent $ 2 on the bus . It took me ALMOST AN HOUR to get home from the airport . I could have WALKED in that amount of time !
Question: Why could she have walked ?
Option 0: None of the above choices .
Option 1: She could n't drive a car home .
Option 2: The bus was slow .
Option 3: She did n't spend $ 30 on a cab .
Answer: 2