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 is the true correct response 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 would be:

Observations of objects floating upwards without any external force.

This would directly contradict the fundamental principle of gravity, which states that objects are attracted towards each other based on their mass. If objects were observed to float upward without any external forces acting upon them, it would challenge the existence of gravitational attraction.