A student is testing the conductivity of two soild substances.Substance a has high conductivity and ?

substance B has low conductivity.Based on this information, What must be true regarding these two substances? A.Electrons in substance A are able to move more easily than electrons in substance B B.there is more energy stored in chemical bonds in sub stance A than there is in substance B C.the atomic nuclei in substanceA have more m than the atomic nuclei in substance B D.Substance A contains a higher percentage of radioactive atoms than does substance B.