After the battle of Yarmuk which was won by the Muslims Khalid Bin Walid was removed by the Caliph Umar RA from his supreme command. The new supreme commander was?
(A) Saad Bin Abi Waqas RA
(B) Abu Ubayydah RA
(C) Ameer Bin Al-Ass RA
(D) None of the above
Correct Answer is: B