Four students made claims as to the relationship between the mass and weight of an object. Which student(s) have made a correct statement? At least one student is correct but there might be more than one.

1. Student A: "The mass of an object is equal to its weight."

2. Student B: "The more massive an object is, the lighter it will be."
3. Student C: "Weight and mass are completely unrelated factors."
4. Student D: "Weight is the measure of the force of gravity on an object, while mass is a measure of the amount of matter in an object."

Correct statements:

- Student D: "Weight is the measure of the force of gravity on an object, while mass is a measure of the amount of matter in an object."
- Student B: "The more massive an object is, the lighter it will be."

Student D correctly distinguishes between mass and weight, while Student B's statement correctly implies that weight is inversely proportional to mass.