Yesterday I did n't walk or otherwise exercise . Today , I was hoping to make up for it by walking 6 km . I think I did about that distance , but it 's hard to tell from Google maps .

Question: Why is the person attempting to make up for not exercising on the day prior ?
Answer: None of the above choices .They are fulfilling a requirement for an online gym class and must exercise a given number of hoursThey are required to walk to work as they can not afford to take a taxi and they missed the day beforeThey want to get into better shape and must get a certain amount of exercise to do this