The diameter of rain-drop is 0.02 cm. If surface tension of water be 72 × 10-³ newton per meter, then the pressure difference of external and internal surfaces of the drop will be

A) 1.44 × 10⁴ dyne – cm⁻² B) 1.44 × 10⁴ newton – m⁻² C) 1.44 × 10³ dyne – cm⁻² D) 1.44 × 10⁵ newton – m⁻²