Understand the Function Concept Practice Test

A store's computer system tracks customer purchases. For each purchase ID number, the system records the total amount spent. However, when the system malfunctions, some purchase IDs get recorded twice with different amounts. Which statement best describes the relationship between purchase ID and amount spent?

Sarah creates a mapping where she assigns to each student in her class their birth month. She then realizes that three students were born in March and two students were born in July. If Sarah wants to create a function, which modification should she make?