The Difference in Composition Between the Giant Planets and the Terrestrial

Multiple Choice

The difference in composition between the giant planets and the terrestrial planets is most likely caused by the fact that

A) the giant planets are much larger.
B) only the terrestrial planets have iron cores.
C) the terrestrial planets are closer to the Sun.
D) the giant planets are made mostly of carbon.
E) only small differences in chemical composition existed in the solar nebula.