The mаp аbоve shоws 500 millibаr geоpotential height contours. When examining the trough over the Pacific Northwest, we might be interested in identifying the labeled point that has the greatest relative vorticity. We should immediately rule out point C because relative vorticity would not be greatest at this point. Develop a brief discussion that explains why this is the case. Be sure to reference the relevant parts of the relative vorticity equation shown below in your answer. Finally, explain which of the remaining labeled points would have the greatest relative vorticity and why.