A hypothesis is a

Law
Canon
Postulate
Supposition

The correct answer is: D. Supposition

A hypothesis is a supposition or proposed explanation made on the basis of limited evidence as a starting point for further investigation.

A law is a statement based on repeated experimental observations that describes some aspects of the universe.

A canon is a principle or rule established as a basis of action or belief.

A postulate is a statement that is assumed to be true without proof.