The pair of elements that will form a covalent bond is carbon and sulfur.
Covalent bonds typically form between nonmetals, where electrons are shared. Carbon and sulfur are both nonmetals, while aluminum and potassium are metals. Although aluminum and chlorine can form a compound, it would primarily involve ionic bonding. Lithium is also a metal and tends to form ionic bonds, particularly with nonmetals such as oxygen. Thus, carbon and sulfur are the best pair for forming a covalent bond.
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