Final answer:
The law of universal gravitation posits that the gravitational force between two objects is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.
Step-by-step explanation:
The law of universal gravitation states that any two objects in the universe that have mass attract each other. Specifically, the gravitational force between two objects is directly proportional to the product of their masses and inversely proportional to the square of the distance between them. Therefore, the correct answer to the question presented by the student would be option b: Gravitational force between two objects is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.