What was the primary reason that US and European markets adopted E85 as the maximum blend to be used in flexible fuel vehicles?

W) Higher ethanol blends are too expensive

X) Higher ethanol blends are unable to ignite in cold weather

Y) Higher ethanol blends cannot be safely stored

Z) Higher ethanol blends release more CO2 into the atmosphere through deforestation than they conserve
X) Higher Ethanol Blends are Unable to Ignite in Cold Weather