He was brazen when he won the race
The theme of good and evil is at play during this scenario in Frankenstein. In this part, man is depicted as a creature capable of doing evil but is also capable of showing goodness and kindness towards others. Frankenstein was a classic story that has been revived for many generations since it was released.
D. friendly and respectful because it is a friendly letter, you don't want to be sarcastic which could come off as rude, and you don't want it to be formal either