The correct answer is: B. Bihar Sharif
Ibrahim Baya was a general of Sher Shah Suri, who ruled over the Indian subcontinent from 1540 to 1545. He was killed in battle in 1545, and his mausoleum is located in Bihar Sharif, Bihar, India. The mausoleum is a fine example of Mughal architecture, and is one of the most important historical monuments in Bihar.
Option A: Patna is the capital of Bihar. It is a major city in India, and is home to many important historical and cultural sites. However, Ibrahim Baya’s mausoleum is not located in Patna.
Option B: Bihar Sharif is a town in Bihar, India. It is the headquarters of Nalanda district. Ibrahim Baya’s mausoleum is located in Bihar Sharif.
Option C: Darbhanga is a city in Bihar, India. It is the headquarters of Darbhanga district. Ibrahim Baya’s mausoleum is not located in Darbhanga.
Option D: Gaya is a city in Bihar, India. It is the headquarters of Gaya district. Ibrahim Baya’s mausoleum is not located in Gaya.