In the Four Terrestrial Planets, the Densest, Heaviest Materials Are

Multiple Choice

In the four terrestrial planets, the densest, heaviest materials are at the center and not evenly distributed throughout the planet. Scientists interpret this observation to mean that:

A) the four terrestrial planets must once have been inside the Sun
B) the four terrestrial planets must once have been hot enough to be molten (like a liquid)
C) the four terrestrial planets must have formed where Jupiter and Saturn now are
D) the four terrestrial planets must have collided with each other many times
E) none of the above