Li-Mei Must Read and Reply to Several E-Mail Messages

Li-Mei must read and reply to several e-mail messages. What is the best tip she can follow to make sure that she handles her e-mail professionally?

A) If she can't reply to a message within 24 hours, Li-Mei should just delete the message.
B) Li-Mei should change the subject line if the subject changes.
C) Li-Mei should read and reply to each e-mail message in her inbox before moving on to the next message.
D) Li-Mei should print every e-mail message she receives to make sure she has proper documentation.