Please answer me fast

use a formal address: Mr or Ms + the person's last name if you know it. If you can't find the last name, use a generic title such as Sir or Madam. The respondent may address you by your first name and sign off with their first name.

Explanation:

hope this was helpful. for number one.

c. its asking which of the words need an accent mark. its spelled biografía

what are the options? then i will gladly you.