Answer:
The correct answer is letter "C": Economical.
Step-by-step explanation:
An economical message in business writing has a style that uses a few words to provide readable, accurate, objective and direct information to the audience. In the phrase:
"I see that there appears to be an absolutely unfamiliar potential client requesting to converse with you in the upcoming afternoon interval. Would you prefer that I reject his request because you are already experiencing an overload of professional work demands? "
There is redundancy and exuberance. The speaker or writer is adding needless words while transmitting the message. Thus, it does not meet the economical characteristic of business writing.