The correct answer is b.) All three developed progressively more accurate models of our solar system.
Indeed, Copernicus proposed the heliocentric model, placing the Sun as the center of the universe and not Earth, in the 15th century. Kepler discovered the three scientific laws of planetary orbit around the Sun in the 17th century. Newton created the laws of universal gravitation and motion in the 17th century as well, basing a good deal of his research on Kepler’s work.
A part of Clinton's 'domestic agenda' is to help the middle class with more jobs and with income growth, to help the poor who are trapped in whole neighborhoods where there's no work, few stable families and where violence is the norm.
No he promised him no promises so the answer would be C! :)