Step 1: Identify the 23rd Tirthankara.
Lord Parshvanatha is the twenty-third Tirthankara in Jainism.
He was a significant Jain spiritual leader who lived in the 9th century BCE.
Step 2: Parshvanatha's Birthplace.
Jain scriptures state that Lord Parshvanatha was born in Varanasi (Kashi).
His father, Ashvasena, was the king of Varanasi, and his mother was Vama Devi.
Step 3: Analyze Options.
- (A) Ayodhya: Incorrect. It is the birthplace of Lord Rishabhdev (1st Tirthankara), not the 23rd.
- (B) Varanasi: Correct. Parshvanatha was born here.
- (C) Barabanki: Incorrect. It is not associated with any Jain Tirthankaras.
- (D) Hastinapur: Incorrect. It is associated with the 17th, 18th, and 19th Tirthankaras, not the 23rd.
Step 4: Conclusion.
Varanasi is the correct answer as it is the birthplace of Lord Parshvanatha.