The correct answer is B. phenol.
Phenol is an organic compound with the chemical formula C6H5OH. It is a white, crystalline solid that is soluble in water. Phenol is a weak acid and is used in the production of many other chemicals, including picric acid, phenolphthalein, bakelite, salol, aspirin, and salicylic acid.
Benzene is an organic compound with the chemical formula C6H6. It is a colorless, flammable liquid that is used as a solvent and in the production of many other chemicals. Benzene is not used in the production of picric acid, phenolphthalein, bakelite, salol, aspirin, or salicylic acid.
Nitrobenzene is an organic compound with the chemical formula C6H5NO2. It is a yellow, oily liquid that is used as a solvent and in the production of many other chemicals. Nitrobenzene is not used in the production of picric acid, phenolphthalein, bakelite, salol, aspirin, or salicylic acid.
Aniline is an organic compound with the chemical formula C6H5NH2. It is a colorless, flammable liquid that is used as a solvent and in the production of many other chemicals. Aniline is not used in the production of picric acid, phenolphthalein, bakelite, salol, aspirin, or salicylic acid.