The group of atoms that bond covalently with one another is the Silicon and Sulfur. Thus, option C is correct.
A covalent bond is given as the sharing of the electrons between the atoms. The bond is stronger than the ionic bond and is formed by the elements that contain less difference in their electronegativities.
The electronegativity of silicon is 1.9, and that of sulfur is 2.58. Due to the less difference in the electronegativity between the two atoms, they will form covalent bond. Thus, option C is correct.
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