In the Years After Newton Published His Laws of Motion

In the years after Newton published his laws of motion, it was found that the observed positions of the planet Uranus did not match the predictions of Newton's theory. The reason for this turned out to be

A) the gravitational influence of a previously unknown planet.
B) the perturbing effects of previously unknown satellites (moons) of Uranus.
C) inaccuracies in the observations.
D) inaccuracies in Newton's laws (later corrected by general relativity) .