Discussion
Geostrophic wind occurs when pressure gradient force balances
Answer: A
Geostrophic wind occurs when the pressure gradient force is balanced by the Coriolis force alone. The wind then blows parallel to the isobars, with no component across them. This is the situation in the free atmosphere above the friction layer, where the surface drag is negligible. Friction is absent, so the option adding a frictional force describes the lower, non-geostrophic boundary-layer wind, where the wind crosses the isobars at an angle. Centripetal force enters the gradient wind, where the isobars are curved, not the straight-isobar geostrophic case.
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