Final answer:
Bronze, an alloy of copper and tin, represents a substitutional solid solution with incomplete solubility, as tin does not have complete solubility in copper.
Step-by-step explanation:
A substitutional solid solution with incomplete solubility refers to an alloy in which the components do not have unlimited solubility in each other.
From the options provided, brass is an alloy of copper and zinc, bronze is an alloy of copper and tin, while steel is an alloy of iron with carbon (and sometimes other elements). Finally, pewter is an alloy primarily made up of tin, with small amounts of other metals like copper.
Among these options, bronze does not have complete solubility of tin in copper, which makes it an example of a substitutional solid solution with incomplete solubility.