When a question gives you a new rule, you should always see how the new rule affects other rules. In this case, you should draw the transfers that occur when you place M third:
If we don’t place mulches beside these two M’s, we have four transfers. That’s too many transfers, so we need to place our third M in the middle, to eliminate two of the transfers:
We can only place three M’s. So, that means all other loads must be stone. E is CORRECT: the first load is stone.
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