The correct option is
2 and 3 only
.Explanation
The Mahanadi is a major east-flowing river of the Peninsular drainage system. It is known for its extensive catchment area covering Central and Eastern India.
Statement 1 is Incorrect: The Mahanadi rises near Sihawa in the Raipur district of Chhattisgarh. It is the Godavari river that rises in the Trimbakeshwar (Trimbak) plateau in the Nashik district of Maharashtra.
Statement 2 is Correct: The drainage basin of the Mahanadi is shared by Maharashtra, Chhattisgarh, Jharkhand, and Odisha. According to standard geographical data, approximately 53 % of its drainage basin lies in Madhya Pradesh and Chhattisgarh, while the remaining 47 % lies in Odisha.
Statement 3 is Correct: The Mahanadi flows eastward through Odisha and forms a large delta before discharging its water into the Bay of Bengal.
Key Takeaway: The Mahanadi originates in the highlands of Chhattisgarh (Sihawa), not the Western Ghats (Trimbak), and its basin is primarily divided between Chhattisgarh and Odisha.