Andi Uses All of Her Income to Purchase Books and Games

Multiple Choice

Andi uses all of her income to purchase books and games. At any two points A and B on Andi's budget constraint,

A) Andi is spending all of her income on books and games.
B) Andi is spending one half of her income on books and the other half of her income on games.
C) the price of books relative to the price of games is different.
D) All of the above are correct.