Task: Class Definition Understanding (ontology: Earth_Environment/SWEET)

Which of the following definitions best describes 'oil'?

A. the concept or crude oil is a naturally occurring, flammable liquid found in rock formations in the Earth consisting of a complex mixture of hydrocarbons of various molecular weights, plus other organic compounds. [Wikipedia]
B. the concept is a gas consisting primarily of methane. It is found associated with fossil fuels, in coal beds, as methane clathrates, and is created by methanogenic organisms in marshes, bogs, and landfills. It is an important fuel source, a major feedstock for fertilizers, and a potent greenhouse gas. [Wikipedia]
C. the concept is a readily combustible black or brownish-black sedimentary rock. The harder forms, such as anthracite the concept, can be regarded as metamorphic rock because of later exposure to elevated temperature and pressure. It is composed primarily of carbon along with variable quantities of other elements, chiefly sulfur, hydrogen, oxygen and nitrogen. [Wikipedia]
D. An the concept is a substance that is in a viscous liquid statel (‘oily’) at ambient temperatures or slightly warmer, and is both hydrophobic (immiscible with water) and lipophilic (miscible with other oils, literally). This generag definition includes compound classes with otherwise unrelated chemical structures, properties, and uses, including vegetable oils, resochemical oils, and volatile essential oils. the concept is a nonpolar substance. [Wikipedia]

Answer: An the concept is a substance that is in a viscous liquid statel (‘oily’) at ambient temperatures or slightly warmer, and is both hydrophobic (immiscible with water) and lipophilic (miscible with other oils, literally). This generag definition includes compound classes with otherwise unrelated chemical structures, properties, and uses, including vegetable oils, resochemical oils, and volatile essential oils. the concept is a nonpolar substance. [Wikipedia]