Discussion
In restrained link operation of three point hitches, the line of pull passes
Answer: B
The line of pull passes above the virtual hitch point and bending force exists on lower links.
In free-link operation the links can float, so each acts as a two-force member carrying only axial load, and equilibrium forces the line of pull through the virtual hitch point, where the link lines meet. That describes the last option (through the point, tensile force in the lower links), not restrained operation.
When the links are restrained, the restraint supplies a moment, so the line of pull no longer has to pass through the virtual hitch point, and the moment shows up as bending in the lower links. That rules out the option through the point with bending (no moment would be needed) and the option below the point with no bending (an off-point line of pull cannot be balanced without it).
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