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Petroleum ether or n-heptane would be the best solvents for extracting isobutyl oleate from your list. Isobutyl oleate is an ester, and it's generally more soluble in non-polar solvents. Petroleum ether and n-heptane are both non-polar solvents, making them suitable for extracting isobutyl oleate. Acetone, methanol, diethyl ether, and n-decane are either polar solvents or have significant polarity, which would make them less effective in extracting a non-polar compound like isobutyl oleate.