a) EVOH > PET > HDPE > Al
b) Al > EVOH > HDPE > PET
c) PET > EVOH > HDPE > Al
d) EVOH > HDPE > PET > Al
Answer: a
Explanation: The correct order of decreasing Water Vapour Transmission Rate is Ethylene Vinyl Alcohol > Polyethylene Terephthalate > High Density Polyethylene > Aluminium. Hence, amongst the given films, Aluminium is the best water vapour barrier.
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