A. Your insurance policy will likely not cover the damages to your car.
The condition for a profit maximising point is where MR = MC.
When MR is greater than MC, the firm should increase production to take hold of the extra profit, therefore Mara should increase production.
Your answer would be, If the Marginal Product of labor increases/rises, The Marginal Cost of Output FALLS.
If the Marginal Product of labor Falls, The Marginal Cost of Output RISES.
Hope that helps!!!