If the value of M-N is 0, then what should m and N satisfy A. M + n = 0; B, Mn = 0; C, M = n ≠ 0; m of D, n ≠ 1

If the value of M-N is 0, then what should m and N satisfy A. M + n = 0; B, Mn = 0; C, M = n ≠ 0; m of D, n ≠ 1

If the value of (m-n) / (M & # 178; + n & # 178;) is 0
Then the numerator M-N = 0 and the denominator M & # 178; + n & # 178; ≠ 0
So m = n and M & # 178; ≠ - N & # 178;
Because when m = 0 and N = 0, M & # 178; = - N & # 178;
So there are
M = n and m ≠ 0, n ≠ 0
That is, M = n ≠ 0
So, we should choose C