Which conclusion, based on measurements of the ball in the lab in this lesson, is correct? a. the density of the ball was 1.48 g/cm3, so it was made of synthetic or manufactured rubber. b. the density of the ball was 1.23 g/cm3, so it was made of neoprene rubber. c. the density of the ball was 1.48 g/cm3, so it was made of natural rubber. d. the density of the ball was 0.90 g/cm3, so it was made of gum rubber.