A.I. Explanation:

Option 1: "It pulls all objects towards each other."

Explanation: The text states that any object exerts a force on another object, indicating that gravity pulls all objects towards each other. This aligns with Newton's description of gravity as a force of attraction between masses, supporting the idea that gravity acts universally on all objects.

Option 2: "It is an electromagnetic force in the universe."

Explanation: This option is incorrect because the text specifically describes gravity as a force of attraction between masses, not as an electromagnetic force. Electromagnetic forces are distinct from gravitational forces, which are based on mass rather than charge.

Option 3: "The bigger something is, the faster it will fall."

Explanation: This statement is misleading. The text does not claim that size affects the speed of falling; rather, it explains that while larger masses exert a greater force, the speed of falling is not directly related to size but rather to gravitational force and resistance.

Option 4: "Attraction between objects causes it, altering their mass."

Explanation: This option is incorrect because the text explains that gravity is a force of attraction between objects, but it does not state that this attraction alters their mass. Mass remains constant regardless of gravitational attraction, making this statement misleading.