Which is the correct equation for: iron + sulfur → iron (III) sulfide

The correct option is D.
They are equations that make use of chemical formulae and symbols to represent chemical reactions. The left-hand side of a chemical equation represents the reactants and the right-hand side represents the products. These entities are separated by a symbol that describes the direction of the reaction. Each reacting entity is also assigned its corresponding stoichiometric coefficient.
There are five basic categories given below.
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