A particle of mass m moves in a circular orbit in a central potential field U(r)=12kr2. If Bohr's quantization condition is applied, radii of possible orbitals and energy levels vary with quantum number n as:
A. rn∝n²,En∝1/n²
B. rn∝n,En∝n
C. rn∝√n,En∝1/n
D. rn∝√n,En∝n
