In a certain code language,

'A x B' means ‘A is the son of B’,

'A – B' means ‘A is the brother of B’,

'A + B' means ‘A is the wife of B’,

'A % B' means ‘A is the father of B’.

How is M related to T if ‘M + N x P % S – T’?

The correct option is Brother's wife.

To find how M is related to T in the expression M + N x P % S - T, let's decode the relations step-by-step from right to left:

1. Decode S - T:
According to the given code, 'A - B' means 'A is the brother of B'.
Therefore, S is the brother of T.

2. Decode P % S:
'A % B' means 'A is the father of B'.
Therefore, P is the father of S.
Since S is the brother of T, P is also the father of T.

3. Decode N x P:
'A x B' means 'A is the son of B'.
Therefore, N is the son of P.
Since N is the son of P, and P is the father of T, it follows that N is the brother of T.

4. Decode M + N:
'A + B' means 'A is the wife of B'.
Therefore, M is the wife of N.

Conclusion:
Since N is the brother of T, and M is the wife of N, M is the brother's wife of T.