What are ionic compounds. Explain.
Explain what is gravity.

an ionic compound is a chemical compound composed of ions held together by electrostatic forces termed ionic bonding

An ionic bond is a bond between ions where oppositely charged atoms attract each other and cancel their charges to produce neutral compounds

Explanation:

gravity, also called gravitation, in mechanics, the universal force of attraction acting between all matter. On Earth all bodies have a weight, or downward force of gravity, proportional to their mass, which Earth's mass exerts on them. Gravity is measured by the acceleration that it gives to freely falling objects

the correct answer would be d. hope this !