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Verbal·Standard English Conventions·Boundaries

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In a chemical reaction, the value known as molar mass helps convert between the mass of the reactants and the mass of the product. The gaseous __________ masses of $42.08$ and $44.10\text{ g/mol}$, respectively.

Which choice completes the text so that it conforms to the conventions of Standard English?

A

compounds propylene and propane have molar

B

compounds, propylene and propane have molar

C

compounds propylene and propane, have molar

D

compounds, propylene and propane, have molar