Write the next sentence in this paragraph:

How to address envelopes with attn
Write " attn " followed by the name of the recipient.
The " attn " line should always appear at the very top of your delivery address, just before the name of the person you're sending it to. Use a colon after " attn " to make it clearly readable.

Choose your answer from:
A). Include the author's name followed by their full middle initial (if any). Unless it is his or her middle name, you may skip this step.;
B). This line signifies to the mail carrier exactly for whom the letter is intended. For example, write " attn: john smith, " where " john smith " is replaced with your recipient's name.;
C). Never put a period after the salutation. If the recipient reads your salutation, he or she will not know that you're mailing an envelope with attn.;
D). Write the recipient's last name. The name of the recipient should always appear on the top left-hand side of the envelope, followed by their first and last name as well.;
B).