Which of the two are the less dense material shown?

Material Mass Volume
Rock. 1000. 0.5
Pillow. 200. 10
Bottle of soda. 2000. 2
Loaf of bread. 100. 1

A) loaf of bread and pillow
B) rock and bottle of soda
C) bottle of soda and loaf of bread
D) loaf of bread and rock