A test particle is moving in a circular orbit in the gravitational field produced by a mass density `rho(r)=K/r^2`. Identify the correct relation between the radius R of the particle’s orbit and its period T:
A. Carbon `overset("conc")underset(HNO_(3))rarr H_(2)CO_(3)`
B. Phosphorus `overset("conc")underset(HNO_(3))rarr H_(3)PO_(4)`
C. Sulphur `overset("conc")underset(HNO_(3))rarr H_(2)SO_(4)`
D. Iodine `overset("conc")underset(HNO_(3))HIO_(4)`
