Which one is NOT a proper manner when writing an email?

A.Don’t neglect to say “please” and “thank you.”

B.It cannot hurt to be formal in a business email.

C.It’s okay to address a person with his or her first name only in a formal business email.

D.Formal title and the recipient’s last name should be used in a formal business email.

正确答案：It’s okay to address a person with his or her first name only in a formal business email.