Concept:To find the remainder, reduce the bases modulo 4 and use modular arithmetic.Explanation:The expression is 968−768.We need its remainder when divided by 4.Since 9≡1(mod4), we get 968≡168≡1(mod4).Since 7≡−1(mod4), we get 768≡(−1)68≡1(mod4), because 68 is even.Therefore, 968−768≡1−1≡0(mod4).So the expression is exactly divisible by 4.The remainder is 0.Answer:The remainder is 0, which matches option D.