The correct answer to the best description of a molecule from among the statements above simply is:
a group of atoms that are held together by covalent bonds.
The correct answer choice is option d.
A molecule can simply be defined as the a chemical substance which can normally exist alone and also still retain the properties of that substance.
That being said, these molecules of substances are also actually atomic groups which are most of the time held together by covalent bond.
So therefore, it can be deduced from above that the structure of molecules are bonded together covalently.
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