Correct option is C
Given:
Symbols | × | - | + |
Relations | Daughter | Sister | Father |
Expression: "M – N + O × L"


Assertion: L is daughter in law of J?
Reason A: J × M

Reason A: cannot determine that L is daughter in law of J.
Reason B: J + M

Reason (B) shows that L is daughter in law of J.
So, Only B is the reason behind the assertion.
Thus, correct option is (c).