Which of the Following Processes Is a Chemical Change

Multiple Choice

Which of the following processes is a chemical change?

A) Dry ice sublimes when left on the demo table in lecture.
B) The light on a candle burns until a bell jar is placed over it for a period of time.
C) When a few drops of red food coloring are added to a beaker of hot water, the water immediately turns red.
D) Liquid nitrogen dumped onto the floor vaporizes at room temperature.
E) None of the above processes are chemical changes.