Answer:
Letter c is correct. Make the message more formal, remove the personal discussion, and give more specifics about the survey plan.
Explanation:
A poorly written message can damage an employee's image within an organization. So when sending a message to a colleague and a supervisor at the same time, it is ideal that personal discussions are removed and the focus is only on business matters. Formality must be maintained to convey respect and professional attitude in order to avoid communication noise and achieve clarity in the message.