Two main ideas in the article are that open clusters and globular clusters have little in common and that globular clusters are very old. Which sentence from the article provides
support for both ideas?
A "Many globular clusters are as much as a few hundred light-years across." (paragraph 3)
B "You can't find a globular cluster with your own eyes; they are too distant and too dim."
(paragraph 4)
C "Compared with globular clusters, open clusters are young-just hundreds of millions of
years old, not billions." (paragraph 5)
D "Globular and open clusters are different in many other ways, including how they form,
what their stars are made of, and where they appear in the universe." (paragraph 6)