The correct answer among all the other choices is I just have to dot an i (italic) and cross a t (italic) or two. the sentence that uses italics correctly. Thank you for posting you question. I hope this answer helped you. Let me know if you need more help.
The answer is:
B.
She couldn't remember which suitcase was yours.
Couldn't has its apostrophe between the "n" and the "t", and yours is used properly.
I would say relative pronouns
The second sentence (B.) should come last in a paragraph.
