What should you always keep in mind when reading a text that uses compare/contrast format?

Which of the following best explains why the author chose the compare-and-contrast structure for paragraph 2

12. why do you think that using a conversational tone with plain language when writing businesses messages is a good idea?

Which of the following is best written: 1. my favorite day of the year is july 24 my birthday 2. my favorite day, of the year, is july 24 my birthday 3. my favorite day of the year is july 24-my birthday 4. my favorite day of the year is (july 24) my birthday