To answer this question, you need to understand the common name for the compound NaCl.
Option A) Common salt - This option is correct. NaCl is commonly known as common salt. It is a white crystalline solid that is used as a seasoning and preservative in food.
Option B) Phenol - This option is incorrect. Phenol is a different compound with the chemical formula C6H6O.
Option C) Oil - This option is incorrect. Oil is a generic term for a variety of substances that are liquid at room temperature, such as vegetable oil or mineral oil. It is not the common name for NaCl.
Option D) Sugar - This option is incorrect. Sugar refers to a class of sweet-tasting substances, such as sucrose or glucose. It is not the common name for NaCl.
The correct answer is A) common salt. This option is correct because NaCl is commonly known as common salt.