Answer:
The statement reflects the best way to improve this e-mail is A subject line should always be included.
Step-by-step explanation:
From the given options the one that can improve the e-mail is adding a subject line, it is imperative informal and business e-mails to add the subject you are talking about since this shows the person how urgent it is and gives an idea of the information it will provide, this immediately eliminates options B and C as correct answers and the messages should be sent only to the people involved it is not necessary to CC people.