Do note that part c can also be calculated by making (dπ/dQ) = 0.
Instead what we have done is :
dπ/dQ = (dπ/dL)*(dL/dQ) = 0
d(dπ/dQ)/dQ = Second order derivative of π is been replaced by d(dπ/dL)/dL due to similar calculations.
We know that dL/dQ is only equal to zero when L=0 which is not desirable.
Hence we have used the condition dπ/dL = 0 to make the solving easier.
You could still do the problem using dπ/dQ = 0 though, it will give the same answer.
I've just written the functions in part b in terms of Q as they are being used in the graph and the visualisation becomes easier.
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