In the setup, I showed how the rules lead to three very restricted scenarios. This question is asking how to completely determine placement, so we should start from the most restricted scenario. That was this scenario, which happens if you place K in the fall:
Only L is left flexible. So A is CORRECT. If you place K in the fall, and then also place L, everything is determined.
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GABBY says
In this scenario, we had also assumed M was in the spring. How does K in Fall, L in Spring determine where M/P go in this diagram?