This question evaluates the understanding of labor market dynamics in agriculture. The correct answer is B, as a rise in minimum wage can deter employers from hiring due to increased costs, exacerbating labor shortages. Option A is misleading because while automation reduces labor needs, it does not directly cause shortages. Option C is incorrect as seasonal fluctuations are expected and do not exacerbate shortages. Option D is false; improved conditions may help but do not directly address existing shortages.