Scientist 1’s viewpoint would be weakened by which of the following observations, if true?

A. Scientists have recently discovered a Kuiper Belt comet with a radius of almost 1,500 miles.
B. Pluto only has one moon, Charon, which is half the size of Pluto.
C. Planets can be distinguished from comets by the lack of gas and dust particles in the wake of their orbits.
D. Comets and asteroids are capable of generating nuclear fission.