Please answer the following question: Read the following article and select the best answer. Article: David is a twelve-year-old boy. He is tall and strong with short blond hair. He likes sports and reading. Every week David gets ten dollars from his parents. This money is his weekly pocket money. It's not a present. David must work for the family to get the money. On Monday, David must sweep the floor and walk the dog after he finishes his homework. On Tuesday, David must take out the rubbish bags in the morning and clean the garden after school. On Wednesday, he should wash the dishes and clean the kitchen after dinner. On Thursday, he helps his mother do some cooking. Sometimes he has to go to the supermarket to buy some food and drinks. On Friday, he should water (...... ) the flowers in the garden after school. On Saturday and Sunday, David doesn't need to do the housework, so he goes to the cinema with his classmates or does some shopping in the shopping mall. David wants to buy a new football, but he doesn't have enough money. He is looking forward to getting more pocket money. Question: David has to work for _ days a week to get ten dollars. - four - five - six - seven
A:
five