I'm pretty sure it's C, it makes the most sense.
Hassan is described as young boy with Central Asian features, green eyes, and a cleft lip. He has a docile, patient, and quiet personality. He is physically weak, shown by the fact that he was taken advantage of by an older boy.
Answer:
Persia's standing army was an important factor in Persia's rapid growth because of the elite soldiers within the standing army. They were known as the "Immortals" and tasked to maintain order from within and the outside.
Explanation: