What evidence would have been needed to contradict the theory of gravity before it was proven to be a law?(1 point)

Question

Responses which one is it a b c or d

Consistent measurements showing that the gravitational constant varies significantly on Earth.
Consistent measurements showing that the gravitational constant varies significantly on Earth.

Discovery of a force stronger than gravity that acts universally on all matter.
Discovery of a force stronger than gravity that acts universally on all matter.

Observations of objects floating upwards without any external force.
Observations of objects floating upwards without any external force.

Experiments demonstrating that objects of different masses fall at different rates in a vacuum.

Answer 1

The correct response is:

Observations of objects floating upwards without any external force.

This would directly contradict the principles of gravity as it suggests that there is no gravitational force acting on those objects, which is fundamental to the theory of gravity.