A. Casual and informal
B. Serious and respectful
C. Sarcastic and humorous
D. Overly emotional
Answer: Serious and respectful
A. Casual and informal
B. Serious and respectful
C. Sarcastic and humorous
D. Overly emotional
Answer: Serious and respectful
Additional Information: A professional tone is serious and respectful, maintaining professionalism in all communications.
Subjects: Professional Writing, Business English