Option C exemplifies the most appropriate way to ask for information in a routine inquiry message.
What is the most reasonable and acceptable way to ask for information in a routine inquiry message??
The statement in C uses a polite and formal tone by incorporating "please" and seeks information in a specific and clear manner. This approach is respectful and is likely to encourage a positive response, fostering effective communication in professional or formal settings where politeness is essential.
Thus, the answer is: C) "Could you please provide more information about...".