Which sentence is written in a formal writing style?

i really love my journalism class because it's super fun and engaging.

i know the local newspaper reporters don't have writing skills as good as me.

by taking journalism courses, one may be prepared for several exciting careers.

you know, working for a web design company is a really awesome thing todo.

The correct answer is C. By taking journalism courses, one may be prepared for several exciting careers.

Explanation:

The formal writing style is mainly characterized by the use of formal or sophisticated words such as technical words, correct grammar and spelling and by avoiding the use of the pronouns "I"/ "You" and the use of colloquial terms of slangs. According to this, the sentence that uses formal writing style is "By taking journalism courses, one may be prepared for several exciting careers" because this is the only sentence that does not use the pronoun "I" or "you" that are considered informal, also this follows the rules about language and grammar and avoids using informal elements such as contractions or phrases such as "you know" or "super fun" find in other options.

op: object of preposition