संकर प्रयोगात कर्ता ______ नसतो.
अ. द्वितीय पुरुषी
ब. प्रथम पुरुषी
क. तृतीय पुरुषी

The correct answer is Option B (Only b is correct).

Key Points:
• In Marathi grammar, Sankara/Sankirna Prayog (Mixed Voice) arises when characteristics of two basic voices mix together.
• Kartru-Karma Sankar (कर्तृ-कर्म संकर): The subject is strictly Second Person ('तू' or 'तुम्ही') and object is Third Person.
• Karma-Bhava Sankar (कर्म-भाव संकर): Subject can be Third/Second Person.
• Kartru-Bhava Sankar (कर्तृ-भाव संकर): The subject is strictly Second Person ('तू' or 'तुम्ही').
• A fundamental grammatical property across Sankar Prayog constructions is that the subject is never in the First Person (प्रथम पुरुषी कर्ता नसतो).
• Hence, statement 'ब' is strictly correct, making Option (2) 'फक्त ब बरोबर' the official correct answer.
• Key Takeaway: In Sankar Prayog, the subject is never First Person (प्रथम पुरुषी नसतो); it typically requires Second or Third Person.