A tautology is a statement that is true under every assignment of truth values to its components. Its truth is guaranteed by its logical form alone. Such statements are logically necessary and cannot be false. Therefore the description in the stem matches the concept of a tautology.
Option A:
Option A, contradiction, is always false under every possible valuation. It represents the opposite logical extreme from a tautology. Hence contradiction does not fit the stem.
Option B:
Option B, contingency, is a statement that is true under some valuations and false under others. Its truth is not fixed across all possibilities. Therefore contingency is not the correct answer here.
Option C:
Option C correctly names tautology as the always true compound statement described. Tautologies play an important role in logical equivalence and proof. Thus tautology is the appropriate choice.
Option D:
Option D, paradox, refers informally to a statement that seems self-contradictory or absurd yet often reveals a truth. It is not defined as a statement true in all valuations. Consequently paradox is not suitable here.
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