These three crates are all 1 m off the ground. which statement about the force of the earth's gravity pulling on the crates is true?

The formula for the force of the Earth's gravity is
F = mg
where m is the mass of the object and g is the acceleration due to gravity
The value of g is a constant, therefore, the only value that would differ among the three crates is the mass. The greater the mass, the greater is the force of the pull of the gravity.

So, if the carats are placed at 1 m above the ground and there is a force,f of gravity,g present to pull the very object to itself then we can say that each of crate must have a specific mass, m which tends the body to be pulled towards the surface of the earth. And that force,F of the gravity happens to be around 9.8 m/sec² in total. As, each body requires these set of information in order to evaluate its total amount of potential energy,P.E in it.P.E=m×g×h.