'Mo > No' means that Mo is the daughter of No.
'Mo # No' means Mo is the father of No.
'Mo $ No' means Mo is the mother of No.
'Mo / No' means Mo is the brother of No.
Based on the above, how is Po related to Ko in the given expression?
Po $ Qo # Ro / To > Ko

'Mo > No' means that Mo is the daughter of No.

So, Po is Ko’s Husband's mother.

Thus, correct option is (d).