As was said the mechanical properties are independant of the structure. Strength, Modulus etc.
The problem as stated is also independent of the structure. Beam theory would say the highest Moment in the structure would be M=W*L Where W is the applied load and L is the length to the fulcrum. (not real clear if you have a point load or uniform load.) If Uniform then it would be M=A*L^2/2
Now the cross section structure would come into play. Without knowing all the dimensions, the beam with the widest top and bottom flanges would resist the load the best.
The Stress in the outer fibers of the part is calaulated with the equasion. S=Mc/I Where S is Stress, M is the Moment load calculated above. C is the distance from the neutral axis to the edge of the beam (h/2 in this case) and I is the structural Moment of Inertia. (I=BH^3/2 for a rectangle)
Then your Margin of safety is calculated by MS= S material/ S calcualted -1
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