Explanation:
The correct answer is option 'A' - Kaumudi Mahotsava.

Introduction:
Chandragupta I was the founder of the Gupta Empire, which ruled over a major part of ancient India from the 4th to the 6th century CE. The succession of Chandragupta I to the throne is described in the work known as Kaumudi Mahotsava.

Details:
- Kaumudi Mahotsava is a Sanskrit play written by the renowned ancient Indian playwright, Rajasekhara. It is a dramatic work that provides insights into the life and times of Chandragupta I.
- The play revolves around the central theme of Chandragupta I's ascension to the throne and his subsequent reign. It sheds light on the political and social circumstances surrounding his rise to power.
- The play portrays Chandragupta I as a noble and courageous ruler who overcomes various challenges to establish his authority and unite the fragmented kingdoms of ancient India.
- Through the narrative of Kaumudi Mahotsava, we learn about the strategies and diplomatic maneuvers employed by Chandragupta I to expand his kingdom and consolidate his power.
- The play also highlights the support and loyalty of key characters, such as his wife, Kumaradevi, and his minister, Chanakya, in Chandragupta I's journey towards becoming a king.
- Additionally, Kaumudi Mahotsava showcases the cultural and artistic excellence of the Gupta Empire during Chandragupta I's reign. It emphasizes the patronage extended to scholars, poets, and artists, which contributed to the flourishing of literature and the arts.
- The work provides valuable historical insights into the Gupta period and the significant role played by Chandragupta I in shaping the empire's destiny.

Conclusion:
The work Kaumudi Mahotsava is a significant literary source that sheds light on the succession of Chandragupta I to the throne and provides insights into his reign as the founder of the Gupta Empire.