According to "Astrophysicist Chronicles Battle over Pluto," why did Dr. Tyson decide to exclude Pluto from the exhibits of planets? A. Because the International Astronomical Union said it was not a planet
B. Because it was too small to be noticeable among the other exhibits
C. Because it displays the characteristics of an icy body rather than a planet
D. Because he didn't have enough room left in the solar system exhibit