Please help me with this question and explain it and mention the alphabetical order from largest to smallest.

In each of the four cases below, the mass (indicated by the large dot) exerts a torque on the rod/mass system around the pivot where the rod attaches to the wall. Assume the rod is massless and all rods have the same length, L. Below, rank the magnitude of the torque about the indicated pivot in each case. A 50 kg B 100 kg C 50 kg 90 kg 30 60