The correct answer is A. urea.
Urea was first synthesized in the laboratory in 1828 by Friedrich Wöhler. He heated ammonium cyanate, which is an inorganic compound, and obtained urea, which is an organic compound. This was a significant discovery, as it showed that organic compounds could be synthesized from inorganic compounds. This discovery helped to disprove the vitalism theory, which held that organic compounds could only be created by living organisms.
Methane is a simple hydrocarbon molecule that is composed of one carbon atom and four hydrogen atoms. It is the simplest alkane, and it is the main component of natural gas. Methane is a colorless, odorless gas that is lighter than air. It is flammable and explosive.
Ethylene is a hydrocarbon molecule that is composed of two carbon atoms and four hydrogen atoms. It is the simplest alkene, and it is a colorless, flammable gas. Ethylene is used in the production of plastics, synthetic fibers, and other chemicals.
Acetic acid is a carboxylic acid that is composed of one carbon atom, two oxygen atoms, and two hydrogen atoms. It is a colorless, flammable liquid that has a sour taste. Acetic acid is used in the production of vinegar, and it is also used in the production of other chemicals.