'दादा पायी चालत आले' या वाक्यातील 'पायी' या सप्तमी विभक्तीच्या रूपाचा कारकार्थ कोणता ?

The correct answer is Option B (करण).

Key Points:
• Case Relations vs. Contextual Meaning (विभक्ती कारकार्थ):
• In Marathi grammar, a noun in one grammatical case form can express the functional Karaka of another case (विभक्तीच्या रूपावरून दुसरा कारकार्थ व्यक्त होणे).
• In 'दादा पायी चालत आले':
• 'पायी' has the locative case suffix 'ई' (सप्तमी रूप).
• However, contextually, 'पायी' (on foot) indicates the MEANS / INSTRUMENT of locomotion/walking (क्रियेचे साधन/वाहन).
• Since the instrument/means of an action is defined as 'करण' (Instrumental relation), the functional कारकार्थ of 'पायी' here is करण.
• Official MPSC key confirms Option (2).
• Key Takeaway: Although 'पायी' has a locative (सप्तमी) form, it denotes the instrument/means of walking, so its Karaka is करण.