Geeta Jayanti Samaroh is celebrated in the month of :

Concept: Major Hindu religious observances are fixed to a specific tithi (lunar day) within a named lunar month of the Hindu calendar. Geeta Jayanti marks the day Lord Krishna recited the Bhagavad Gita to Arjuna at Kurukshetra, and by tradition it is fixed to Shukla Paksha Ekadashi (Mokshada Ekadashi) of the lunar month Margashirsha (also called Agrahayana), which usually falls in November-December of the Gregorian calendar.

Application: Geeta Jayanti Samaroh is therefore observed in the month Margashirsha, matching the saved option.

Cross-check: The remaining months do not carry this observance:

• Kartik hosts Diwali, Kartik Purnima and Dev Diwali, not Geeta Jayanti.

• Ashvin hosts Navratri and Dussehra, not Geeta Jayanti.

• Shravana is associated with Shiva-centred observances such as Kanwar Yatra and Teej, not Geeta Jayanti.

Margashirsha is the only month among the four options that carries the Mokshada Ekadashi / Geeta Jayanti observance.