The equation E = mc2 relates energy and

A. force

B. work

C. gravity

D. mass

E=mc2 is when energy is set equal to mass then it is multiplied by the velocity of light squared. The equation relates to energy and D. Mass

E = mc2 is the formula for theory of relativity of Sir Albert Einstein. In this formula, E is energy, m is mass and c is associated to the speed of light. c is considered the constant of proportionality. The answer to this problem is D. mass