Final answer:
Option B is the answer, Gravitational Force, as it is directly proportional to the product of the masses and inversely proportional to the square of the distance between them in Newton's gravitational equation.
Step-by-step explanation:
To graph the equation for universal gravitation with a slope representing the gravitational constant, the y-axis should represent the Gravitational Force. This is because Newton's law of universal gravitation states that the gravitational force (F) between two masses (m1 and m2) is proportional to the product of their masses and inversely proportional to the square of the distance (r) between them.
The equation can be expressed as F = G(m1*m2)/r^2, where G is the gravitational constant. Therefore, for a graph where one axis represents the distance squared (inversely) and the other axis represents the force, the slope of the graph would represent the gravitational constant, G.The slope of the graph represents the value of the gravitational constant, which is approximately 6.67 x 10^-11 N m^2 / kg^2.