The correct answer is **basic truth**.

**Axiom**

A. shaft

B. basic truth

C. wood shank

D. rejoinder

The correct answer is (B) Basic truth; a self-evident and universally accepted truth; a maxim; a universally accepted principle, proposition, or rule; a self-evident or proverbial truth. Also, a proposition, which is assumed in mathematics, in order to examine the results that flow from it.
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Axiom comes from French axiome, Latin axiõma, Greek axios (worthy).

Examples of use:

- From time to time, someone would write an axiom on the blackboard.
- "It takes money to make money," is an often-repeated axiom.