Step 1: Nature of a hypothesis.
A hypothesis is a tentative, testable statement suggesting a possible relationship between variables. It must be empirically verifiable and open to refutation (falsifiability).
Step 2: Evaluate options.
- (A) is correct: hypotheses often originate as shrewd guesses or tentative explanations.
- (B) is correct: hypotheses typically posit relationships between variables.
- (C) is acceptable: hypotheses are empirical in nature, though not yet foregone conclusions.
- (D) is NOT correct: a hypothesis must allow refutability; if it denies refutability, it ceases to be scientific.
Thus, the correct answer is (D).