(A) : Heat transfer always involves temperature difference between two systems (or) two parts of the same system
( R) : Any energy transfer that does not involve temperature difference in some way is not heat

Options

A. Both (A) and (R) are true and (R) is the correct explanation of (A)
B. Both (A) and (R) are true and (R) is not the correct explanation of (A)
C. (A) is true but (R) is false
D. Both (A) and (R) are false

Answer

A