The Electron Orbiting a Proton in a Hydrogen Atom Has $\times$

Multiple Choice

The electron orbiting a proton in a hydrogen atom has a speed of v = 2.19 $\times$ 10⁶ m/s.The magnetic moment of the electron when it is orbiting at the Bohr's radius (= 0.529 nm) is

A) 9.27 $\times$ 10^-24 A . m²
B) 1.86 $\times$ 10^-23 A . m²
C) 3.71 $\times$ 10^-23 A . m²
D) 2.62 $\times$ 10^-23 A . m²
E) none of these is correct.