The correct answer is: C. separate.
A covalent compound is a chemical compound in which atoms are held together by covalent bonds. A covalent bond is a chemical bond that involves the sharing of pairs of electrons between atoms. Covalent bonds are strong and stable, and they are the most common type of bond in organic compounds.
Covalent compounds are typically composed of discrete molecules. A molecule is a group of two or more atoms that are held together by covalent bonds. Discrete molecules have their own unique properties, and they can exist independently of each other.
The other options are incorrect because they do not accurately describe the nature of covalent compounds. Concrete is a hard, dense material that is made from cement, sand, and gravel. Grouped means to be arranged or classified together. Convoluted means to be complex or complicated.
In conclusion, the correct answer to the question “The covalent compunds consist of discrete molecules.” is C. separate.