Newton's Reformulation of Kepler's Third Law Allows Us to Measure

Multiple Choice

Newton's reformulation of Kepler's third law allows us to measure the masses of bodies in orbit around each other, if we can measure:

A) the rotation rate of each object
B) the distances and periods of revolution
C) the eccentricities and semi-major axes
D) the force and the reaction force
E) the sweetness of those fig-filled cookie bars