Concept:The button that opens a dialogue box to compose a new e-mail message is called the create or compose button.Explanation:The sent button shows messages that have been sent.The junk or spam button shows unwanted or suspicious e-mails.The inbox button shows all e-mails received from other people.The create button opens a new message form.This form contains the recipient address, subject, and message content.Users can type a new message and send it from this compose window.Answer:D. create button.