Step 1: Understanding the Concept:
A Dargah is a shrine or tomb built over the grave of a revered religious figure, often a Sufi saint. These are important pilgrimage sites in Islam. The question asks to identify the Sufi saint whose famous dargah is in Ajmer, Rajasthan.
Step 2: Detailed Explanation:
The city of Ajmer in Rajasthan is home to the world-renowned Dargah Sharif, which is the tomb of the Sufi saint Khwaja Moinuddin Chisti. He was a Persian Sufi saint who established the Chishti Order of Sufism in the Indian subcontinent. His dargah is one of the most sacred Muslim shrines in India and is visited by people of all faiths. The dargahs of the other saints listed are located elsewhere: Baba Farid's is in Pakpattan, Pakistan; Qutbuddin Bakhtiyar Kaki's is in Mehrauli, Delhi.
Step 3: Final Answer:
The dargah located at Ajmer belongs to Moinuddin Chisti. Therefore, option (B) is the correct answer.