The correct answer is A. sodium chloride.
Sodium chloride is a chemical compound with the formula NaCl. It is a white, crystalline solid that is the main mineral constituent of common salt. It is a salt of the sodium and chloride ions, and is one of the most abundant chemical compounds on Earth. It is a major component of seawater, and is also found in salt lakes and in mineral deposits. Sodium chloride is used in many industrial processes, and is also used as a food additive.
Sodium nitrate is a chemical compound with the formula NaNO3. It is a white, crystalline solid that is used as a fertilizer, a food additive, and an explosive. It is also known as Chile saltpeter or niter.
Ammonium chloride is a chemical compound with the formula NH4Cl. It is a white, crystalline solid that is used as a fertilizer, a food additive, and a desiccant. It is also known as sal ammoniac.
Calcium chloride is a chemical compound with the formula CaCl2. It is a white, crystalline solid that is used as a desiccant, a water softener, and a road salt. It is also known as common saltpeter.
In conclusion, the chemical name of ‘common salt’ is sodium chloride.