it doesn’t say anything about his friends. Sentence (d)is about his building, so it’s not broad enough either. Besides, the first sentence states that Toby has friends. We know that Toby lives only with his mother and little sister, so we might assume that he wishes his dad still lived with them (b). there’s nothing in the paragraph to support that assumption, and this idea doesn’t include the two main topics of the paragraph-Toby's building and Toby's friends.
What the paragraph adds up to is that Toby is terribly embarrassed about his building, and he is glad none of his friends have seen it (c). This is the main idea. The paragraph opens with the word “fortunately,” so we know that he thinks it’s a good thing none of them have been there. Plus, look at the word choice. Notice how the building is described. It’s “by far the ugliest on the block,” which is saying a lot since it’s stuck between two burnt-out buildings. The writer calls it an “eyesore,” and repeats “orange” with an exclamation point to emphasize how ugly the color is. Everything’s “crooked” in this “poor excuse for a building.” He’s ashamed of where he lives and worries about what his friends Would think if they saw it.