Answer: D. It is a compound made of twenty-four total atoms of three different elements.
Firstly, glucose is a compound composed of twenty-four atoms of which contain carbon, hydrogen, and oxygen. Option A is wrong because glucose as a molecule cannot contain other molecules. In option B, glucose is not an element. Option C is incorrect as glucose is not an atom. A compound is composed of two or more elements. When these elements are bonded chemically to one another, a compound is formed. Glucose is a good example of a compound.