Which of the following is NOT an example of a constraint limiting a decision?

• Susan can't apply for the job she really wants because the hours conflict with her university classes.
• Frank decides to wait until he can afford to put 20% down on a new house, and continues to rent.
• Peter opts to purchase frozen pizza for an upcoming party; he doesn't have enough money to have pizza delivered.
• Bella decides not to purchase another pair of shoes; she thinks they are too similar to those she already owns.