Find the moment of inertia of a uniform annular disc of mass $100 \, g$,having inner radius $10 \, cm$ and outer radius $20 \, cm$,about an axis passing through its centre and perpendicular to its plane.

• A
  $2.5 \times 10^{-3} \, kg \cdot m^2$
• B
  $1.5 \times 10^{-3} \, kg \cdot m^2$
• C
  $5 \times 10^{-3} \, kg \cdot m^2$
• D
  $6 \times 10^{-3} \, kg \cdot m^2$