American ‘sabre-rattling’ is unlikely to bring calm to a Middle East that is ready to explode. Here ‘sabre-rattling’ word means:

Correct Answer: A: Threat of military force

Explanation: The correct answer is A: Threat of military force. 'Sabre-rattling' means Threat of military force. It is an idiomatic expression referring to a show or threat of military power to intimidate an opponent without actually going to war.