A solid, conducting sphere has a net positive charge of ( q = 4.5 \text{C} ) on it. Its radius ( r ) is ( 3.0 \text{m} ). What is the magnitude of the electric field at a distance ( d ) of ( 9.0 \text{m} ) from the center of the sphere?

A) 5.0 N/C
B) 6.0 N/C
C) 7.0 N/C
D) 8.0 N/C