Something which can be taken for granted

The correct answer is: D. Postulate

A postulate is a statement that is assumed to be true without proof. It is a basic principle or assumption that is used to support other statements. Postulates are often used in mathematics and logic.

A doctrine is a set of beliefs or principles that are taught or accepted by a group or organization. Doctrines can be religious, political, or philosophical.

A maxim is a short, pithy statement that expresses a general truth or principle. Maxims are often used

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