The following question, consist of two words each that have a certain relationship to each other, followed by four lettered pairs of words. Select the lettered pair that has the same relationship as the original pair of words: Steel : Alloy :: Zinc : ?

The correct answer is: A. Metal

Steel is an alloy of iron and carbon. An alloy is a mixture of two or more metals, or of a metal and a non-metal. Zinc is a metal. Therefore, the pair of words "Zinc: Metal" has the same relationship as the original pair of words "Steel: Alloy".

The other options are incorrect because:

• Option B, "Non-metal", is not a type of alloy.
• Option C, "Salt", is a compound formed by the reaction of an acid and a base.
• Option D, "Halogen", is a group of elements in the periodic table.