The correct answer is B, Si.Quartz is a crystalline mineral composed of silicon and oxygen atoms. Its chemical formula is SiO₂ (silicon dioxide). It is extensively used as a piezoelectric material due to its ability to generate an electrical charge when subjected to mechanical stress, and vice versa.Piezoelectricity is a property of certain materials like quartz, where mechanical energy can be converted into electrical energy and vice versa. This property makes quartz useful in oscillators, sensors, and other electronic components.