Purpose of the Michelson-Morley experiment?

Question

The purpose of the Michelson-Morley experiment was to

detect possible motion of the Earth relative to the sun.

detect possible motion of the Earth relative to the ether.

determine the velocity of light.

detect possible motion of the sun relative to the ether .

Answer 1

Detect possible motion of the Earth relative to the ether is the best example. What they tried to establish was a reference point to absolute motion, they assumed that the ether was stationary in the universe. An instrument called an interferometer was designed for the experiment.

Answer 2

M-M expt was conceived to measure the motion of the Earth relative to the "ether."

The experiment was intended to show the existence or non-existence of the fluid "ether," through which many had proposed that the Earth and all other celestial bodies were traveling.

I hope this helps!