Correct Option: B

Isa Muhammad Effendi or Ustad Isa was a Persian architect from Iran he and his colleague Ismail Effendi entered the service of the Mughal Emperor Shah Jahan after the Ottoman Sultan Murad IV and the Mughals exchanged ambassadors. Isa Muhammad Effendi is often described as the chief architect of the Taj Mahal. Recent research suggests the Persian architect, Ustad Ahmad Lahauri was the most likely candidate as the chief architect of the Taj, an assertion based on a claim made in writings by Lahauri’s son Lutfullah Muhandis.