Final answer:
Point F represents the choice where Alphonso spends all his money on bus tickets and cannot afford any burgers.
Step-by-step explanation:
Point F represents the alternative choice where Alphonso spends all his money on bus tickets. This means he can afford 20 bus tickets per week, but he will not be able to afford any burgers. Point A represents the choice where Alphonso spends all his money on burgers, allowing him to afford 5 burgers per week but no bus tickets.