Which sentence uses a formal style that is appropriate in an informational piece of writing?

a. athletes should be super careful about what they post since it could keep them from getting into the right university and prevent them from making it in the big leagues.

b. inappropriate posts on social media sites can really foul up a kid's reputation and annihilate friendships, not to mention mess up his whole life.

c. for protection, users should use different passwords for each social media site and e-mail account that requires personal information.

d. don't make up stuff about yourself since it's easy to research your background and find out if what you've posted is a bunch of lies.

C. For protection, users should use different passwords for each social media site and e-mail account that requires personal information.

Explanation:

All other sentences use informal style.

A: in this sentence the phrase super careful is very informal; getting into and big leagues are semi-formal.

B: In this sentence phrases foul up, annihilate friendships, mess up are informal

D: In this sentence phrases  Don't make up stuff, a bunch of lies are informal.

Note: Although sentence C is formal, it lacks clarity.

"For protection, users should use different passwords for each social media site and e-mail account that requires personal information."  Underlined phrase needs clarification.

original oratory is a competitive event in the national speech and debate association, stoa usa, national catholic forensic league, and other high school forensic competitions in which competitors deliver an original speech on a subject of their choosing, though the speech must be factual.racial discrimination refers to discrimination against individuals on the basis of their race. policies of racial segregation may formalize it, but it is also often exerted without being legalized and also it means facing injustice.