Examlex
Which is the correct assignment of the names of the following groups?
Petroleum
A naturally occurring, flammable liquid consisting of a complex mixture of hydrocarbons and other organic compounds, used primarily as fuel and in the production of various chemicals.
Crude Oil
A naturally occurring, unrefined petroleum product composed of hydrocarbon deposits and other organic materials, used as a fuel and raw material in chemical industries.
Opportunity Cost
Surrendering the chance for gains from other choices by opting for one path.
Machinery
Equipment, especially of a mechanical nature, used in the production process of goods.
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