Which of the Following Demonstrates the Law of Demand

Which of the following demonstrates the law of demand?

A) After Jon got a raise at work,he bought more pretzels at $1.50 per pretzel than he did before his raise.
B) Melissa buys fewer muffins at $0.75 per muffin than at $1 per muffin,other things equal.
C) Dave buys more donuts at $0.25 per donut than at $0.50 per donut,other things equal.
D) Kendra buys fewer Snickers at $0.60 per Snickers after the price of Milky Ways falls to $0.50 per Milky Way.