I have a hunch, but it probably makes no sense.
Maybe the use of Mass Points works here.
Set a mass of two of point Q, one for M and one for P.
If B has a mass of one, then point A must have a different mass, and the two masses add to some number.
However, both mass A and mass C add to point P, which has a mass of one.
D has a mass greater than one.
Finally, that means the ACD triangle area is greater than that of ABP triangle.
I'm sure that there is a way better explanation.