The main characters of the story are Aram and Mourad.

Explanation:
- In the given options, option B states that Aram and Mourad are the main characters of the story. This is the correct answer.
- The story revolves around the friendship and adventures of Aram and Mourad.
- Aram is a young boy who narrates the story. He is curious, imaginative, and adventurous.
- Mourad is Aram's cousin and best friend. He is brave, resourceful, and full of mischief.
- The story takes place in Fresno, California, during the early 1900s.
- Aram and Mourad come from an Armenian immigrant family and share a strong bond.
- They often embark on exciting adventures together, exploring the countryside and getting into various escapades.
- One of the notable adventures they undertake is when they decide to ride a horse named Gay-deceiver without permission. This leads to a thrilling and humorous sequence of events.
- Throughout the story, Aram and Mourad's friendship and loyalty are tested as they face challenges and consequences for their actions.
- The author, William Saroyan, beautifully depicts the innocence and resilience of childhood through the characters of Aram and Mourad.
- The story also touches upon themes of freedom, identity, and the immigrant experience.
- Aram and Mourad's antics and their strong bond make them the central focus of the story.
- Overall, the characters of Aram and Mourad drive the narrative and provide insight into the joys and challenges of growing up.