You don’t have to worry about picking the right guy or girl because he /she is already picked for you so it’s less stressful
Pretty sure it's B I don't remember the proper rules of commas and the word "and" but it's either A or B
Okay, did you have a conversation with one of the higher people in your school? If you're uncomfortable report it to the office.
I think the sentence that uses it correctly is the last one.
