Answer: C (naphtha). Poly(propene) is an addition polymer of propene, C₃H₆. Propene is a small alkene made by the catalytic cracking of a heavier petroleum fraction.
Naphtha is the medium-boiling fraction that is cracked on a large scale to make small alkenes (ethene, propene and butene) for the petrochemical industry, so it is the main feedstock for manufacturing propene.
Bitumen is the thick residue used for road surfacing; diesel is a fuel; and paraffin (kerosene) is used as jet fuel and heating oil — none of these is the feedstock for propene.
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