(B) The correct answer is $B$. Molecules are composed of atoms and are extremely small in size,typically ranging from a few $\mathring{A}$ to a few na

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(B) The correct answer is $B$. Molecules are composed of atoms and are extremely small in size,typically ranging from a few $\mathring{A}$ to a few nanometers.Because they are far below the resolution limit of a standard light microscope,they are classified as $Sub-microscopic$ entities.