Which of the following, if true, would be most useful in supporting the conclusions drawn

A. There is firm evidence that the absolute age of the Milky Way galaxy is between 10 and 17 billion years.
B. A survey reveals that a galaxy close to the Milky Way galaxy contains globular clusters of ages close to the age of Palomar 12.
C. A mathematical model proves that small gas clouds move in regular patterns.
D. Space probes indicate that the stars in the Milky Way galaxy are composed of several different types of gas.
E. A study of over 1,500 individual stars in the halo of the Milky Way galaxy indicates wide discrepancies in there ages.