Which scientist established that the various form of energy mechanical, electrical and heat are basically the same and can be changed from one form into another...? Mcqs

Which scientist established that the various form of energy mechanical, electrical and heat are basically the same and can be changed from one form into another...?

(A) John Dalton

(B) William Thomson

(C) Albert Einstein

(D) James Prescott Joule

Source: This question is taken from the Everyday Science