This painting shows an artist's conception of what it would look like to be within Saturn's system of rings. Notice the many whitish "balls" visible in this painting. Based on what you have learned about rings, about how large are each of these "balls," on average?
A) about a size that you could hold in your arms
B) about the size of a large asteroid
C) about the size of Earth's Moon
D) they are microscopic clusters of about 10 to 20 atoms each.