The correct option is D Qutubuddin Mubarak
After Malik Kafur's murder, the nobles offered the post of regent to Mubarak Shah. However, Mubarak Shah believed that as a regent, his life would be in constant danger. Initially, he rejected the offer and instead requested to be allowed to flee to another country with his mother. Nevertheless, the nobles persuaded him to accept the regency. Mubarak Shah thus became the regent of his younger step-brother Shihabuddin.