The figure shows four identical open-top tanks filled to the brim with water and sitting on a scale. Balls float in tanks (2) and (3), but an object sinks to the bottom in tank (4). Which of the following correctly ranks the weights shown on the scales?

a) (1)<(2)<(3)<(4)
b) (1)<(2) = (3)<(4)
c) (1)<(2) = (3) = (4)
d) (1) = (2) = (3)<(4)
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