Question

Please Help!
The function n(d)=4*3^d-1 represents the number of people who receive a newspaper on day D in a delivery schedule.
What does the value 3 represents in this situation?

A. Deliveries were made for 3 days
B. There are 3 people making deliveries
C. Three people received a newspaper on the first day in the schedule
D. The number of people receiving a newspaper on a given day is 3 times what is was the previous day