Which of the following statements about the language and tone of an opinion essay on friendship qualities is TRUE?
A) It should primarily use informal language and slang to sound relatable.
B) It should avoid personal pronouns like 'I' or 'my' completely.
C) It should use formal and objective language, even when expressing personal opinions, and support claims with clear reasoning.
D) It should rely heavily on emotional appeals without logical backing.
E) It should only present facts and avoid any personal interpretation.