"Sorrow knocked at my door, but I was afraid" is an example of <em>D. personification.</em>
Personification is a literary device in which animals, objects or ideas are given human attributes. In this case, sorrow is given the ability to knock at someone's door, but as we know it is only a figure of speech because sorrow cannot knock at the door.
Perhaps D? It could depend on the context of the story though. I hope this helped, good luck! :)
1. Answer: A. Harry feels alone because his family fears his powers, and he can't be around his friends where he feels comfortable expressing himself.
Explanation: He misses his friends and life at Hogwarts, where he is accepted for who he is.
2. Answer: B. "Ever since Harry had come home for the summer holidays, Uncle Vernon had been treating him like a bomb that might go off at any moment, because Harry Potter wasn't a normal boy." (Paragraph 23)
Explanation: His family feels tense and intolerant of Harry's "abnormality" and they jump at the very mentioning of magic.
3:Answer: B. Harry's special powers.
Explanation: Harry accidentally says the word "magic" which Uncle Vernon roars “I WARNED YOU! I WILL NOT TOLERATE MENTION OF YOUR ABNORMALITY UNDER THIS ROOF!”