Which of the following cannot be explained by colliding worlds in the early solar system? A. Asteroid belt B. Earth's tilted rotation axis and moon C. Mars's asymmetric northern and southern hemispheres and Tharsis bulge D. Mercury's large metallic core E. Venus's slow, backward rotation

The correct answer is: A) Asteroid belt.

Explanation:

All of the other events can be explained by colliding worlds in the early solar system but the asteroid belt can't. The asteroid belt originated from the primitive solar nebula as a congregation of planetesimals, which were the precursors of the protoplanets.