The correct option is C Lohani
In 1522 Sher Shah joined under the service of Bahar Khan under Lohani , the ruler of Bihar. His master rewarded him with the title of Sher Khan for his bravery in killing a tiger single - handed. But the intrigues of his enemies compelled him to leave Bihar and he joined the camp of Babur in 1527. After the death of Bahar Khan Lohani , Sher Khan left Mughal service and became the ruler of Bihar.