The pressure-volume graph shows three paths in which a gas expands from an initial state A to a final state B. The change DUA(B in internal energy is the same for each of the paths. Rank the paths according to the heat Q added to the gas, largest to smallest.
(a) 1, 2, 3
(b) 1, 3, 2
(c) 2, 1, 3
(d) 3, 1, 2
(e) 3, 2, 1

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