单项选择。

— Can you say the number 4868 in English?

— Sure! It's ______. [ ]

A.four thousand and eight hundred and sixty-eight

B.four thousand eight hundred and sixty eight

C.four thousand eight hundred and sixty-eight

D.four thousand and eight hundred sixty-eight

已知燃烧1标米3煤气所需理论空气量为4.25标米3/标米3，理论燃烧产物生成量为4.93标米3/标米3，而实际空气量为4.8标米3/标米3，求实际燃烧产物量。