Which of the following is NOT and example of a site factor? A. Between Jacksonville and Tampa
B. soil type
C. Hilltop
D. Humid climate

I'm pretty sure illustrators are often represented among the staff of an advertising agency   

Answer(a) one needs to learn from experts and be determined to be the best in the field;

To communicate effectively, you must understand the various factors that can affect the exchange of messages and to use communication techniques that are most appropriate for each individual situation.