Correct option is B
In a certain code language,
A + B means ‘A is the mother of B’,
A − B means ‘A is the brother of B’,
A × B means ‘A is the wife of B’ and
A ÷ B means ‘A is the father of B’.

How is M related to Q if ‘M − N + O × P ÷ Q’

M is Mother's mother's brother of Q.