Of the following sentences that which is best written is: My favorite day of the year is July 24th—my birthday.
This sentence is best written because it uses punctuation accurately.
After stating the main point which is the fact that July 24th is the speaker's favorite day of the year, a hyphen was used to introduce additional information.
The additional information is that July 24th is the speaker's birthday.
So, this option C uses punctuations correctly.
Learn more about punctuations here:
https://brainly.com/question/1224394
Answer: My Favorite day of the year is July 24th-my birthday is going to be the best written one.
Explanation: