a) EVOH > PET > LDPE > HDPE
b) PET > EVOH > LDPE > HDPE
c) LDPE > HDPE > EVOH > PET
d) LDPE > HDPE > PET > EVOH
Answer: d
Explanation: The correct order of decreasing Oxygen Transmission Rate is Low Density Polyethylene > High Density Polyethylene > Polyethylene Terephthalate > Ethylene Vinyl Alcohol. Hence, amongst the given films, Ethylene Vinyl Alcohol is the best oxygen barrier.
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