What information is included in the contact information?

• A. The recipient's mailing address
• B. The sender's job title
• C. The mailing address, email address, and phone number of the sender
• D. The company name

Answer: (C)

In professional writing, contact information is the set of details that let someone reach you. The most useful and complete block includes multiple ways to contact the sender: the physical mailing address, the email address, and the phone number. The recipient's mailing address is not part of the sender's contact information; it's about where the letter is going, not how to reach the sender. A job title or company name may appear in a signature, but on its own it doesn't provide the practical ways to contact the person. Therefore, the option that lists the mailing address, email address, and phone number of the sender best represents contact information.