"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.
Someone who makes a mistake which leads to his or her destruction like hamlet
He used the money he made to buy more and more equipment sounds like the best choice to show his passionate about his inventions!
