Whose ideas did charles coulomb compare electric forces to?
a) albert einstein
b) isaac newton
c) georg ohm
d) james watts
e) allesandro volta

i chose b) isaac is that correct?

He compared is to B) Isaac Newton

Isaac Newton has earlier on came up with his formula on gravitation as;

F = GMm/r²

Later on Charles Coulomb came up with his formula on electrostatic force as:

F = kQq/r²

You can see his formula is similar to that earlier formulated by Isaac Newton on gravitation. 

B. convex since the words are bigger