Final answer:
A reply message includes message history by default and is directed back to the original sender only, while a forwarded message also includes the history but is not specifically aimed at the original sender, allowing for new recipients. Forwarding does not auto-populate the 'To:' field, unlike replying.
Step-by-step explanation:
To best compare a reply message and a forwarded message, the most accurate statement is that both include the message history by default. When you reply to an email, this action is intended to continue the conversation with the original sender only, usually including the history of the conversation for context. Conversely, when you forward an email, you are sending the original message, or a modified version of it, to a new recipient or recipients, and it also typically includes the conversation history automatically. This is a key function in email communication for sharing information with individuals who were not part of the original conversation.
However, forwarding an email does not automatically populate the 'To:' field, since the new recipients may be different from the original sender or any previous recipients. Meanwhile, a reply will often auto-fill the 'To:' field with the address of the original sender, assuming you're continuing the conversation with the same person or people.