The sentence that best summarizes this passage is the second one: "Islam spread widely through invading armies and voluntary conversion."
The passage focuses on the spread of Islam, and that sentence covers it, while the other ones cover only aspects of the passage.
Answer:
The King his father keeps him company during his trying period.
Explanation:
The story is culled from Rustem and Sohrab, The Epic of Kings by Ferdowsi.
Rustem's horse is stolen from him whilst he slept.
This greatly unsettled him. He went to his father the King of who kept him company until Rakush was found. In between finding Rakush his war steed, he meets and married Tahmineh the daughter of King Samendan.
Cheers!
The answer is D good luck