Perry designed an experiment with a balloon and hose. The steps of the experiment are listed below.
Make 8 dots on a balloon with a marker.
Fill the balloon with water by using the hose.
Observe how the distance between dots changes when the balloon fills with water.
Which of these can be best verified with the help of Perry's experiment?
A. the density of the universe increases when it expands
B.expansion of the universe makes galaxies move farther apart
C.the stars move towards Earth when the universe expands
D.the temperature of the universe increases when it expands
