Question

this scientist stated the the earth was a moving planet
copernicus
descartes
galileo
kepler

Explanation:

Copernicus proposed the heliocentric model which stated the Earth was a moving planet orbiting the Sun. Descartes was a philosopher - mathematician known for his philosophical works and not for this astronomical statement. Galileo supported the heliocentric view but didn't first state the Earth was a moving planet. Kepler formulated laws of planetary motion but his work was building on the heliocentric idea rather than being the first to state the Earth's motion.

Answer:

A. Copernicus