Answer:
"Dylan's e-mails include a signature with his name, mailing address, and phone number."
"Isabel uses Reply when responding to the messages she receives so that the thread of previous messages is included."
"Tomas makes his e-mail messages brief."
Step-by-step explanation:
"Garrett...." is incorrect because, unless his messages really are urgent, he should not label them so.
"Nadine...." Is incorrect because spell check does not always catch grammar mistakes. You should always proofread as well as use spell check.
"....Ana...." Is incorrect because using all capital letters is juvenile.
"....Melissa...." Is incorrect because using exclamation points is also juvenile.
Confirmed with a test I took. If it does not match your answers, it's likely that we were taught different information, however that is unlikely.