When added to the word detect, the suffix which means "a person who" is -ive.
"A person who" means that you need to create a noun which refers to a person by adding that suffix. If you add -ive to detect, you will get the noun detective, which is obviously a person.
The word detectary doesn't exist, and the word detection doesn't refer to a person, but rather the act of detecting.
Answer:
Dear Mrs. Blessing, I would really like to have a coding club at school. My reasoning for wanting one is that I really want to learn how to program. I also think it would be good for the school. It would be good because it could teach us students to better use technology and it could even spark a successful career in the future for students who attend the club. Thank you for reading, And I cant wait for your feedback. Sincerely, whatever my name is
Explanation:
The answer would be, "C", "Loaded Words".