FERMAT 1999 Problem 11

In Circle Land, the numbers 207 and 4520 are shown in the following way:
fermat 1999  problem11q
In Circle Land, what number does the following diagram represent?
fermat 1999 problem  11q2

Answer Choices
A. 30\:105
B. 30\:150
C. 3105
D. 3015
E. 315