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The tallest man. :P

It depends. If for example C is the tallest than A and than B, A would have to carry more than C and B almost nothing.
You could also answer this question with: If there all the same hight than the one whos bodymass is higher than the bodymass of the others since nowhere is defined what weight counts.

Yes. There are so many variables to consider.

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Thanks for this puzzle.