According to the Newtonian theory of gravity, the gravitational force between two bodies depends exclusively on their mass and the distance between them, but is independent of what the bodies are made of.
Your task
Find the assumption that, if added, guarantees the conclusion follows.
Common trap
Answers that only partly bridge the gap, leaving the conclusion unproven.
Winning move
Identify the new term in the conclusion and pick the choice that links it to the evidence.