The addition of A and 8 is giving 3 i.e., a number whose ones digit is 3. This is possible only when digit A is 5. In that case, the addition of A and 8 will give 13 and thus, 1 will be the carry for the next step. In the next step, 1 + 4 + 9 = 14
Therefore, the addition is as follows.
Clearly, B and C are 4 and 1 respectively. Hence, A, B, and C are 5, 4, and 1 respectively.