Concept:Rocket propulsion needs a strong oxidising agent to support the burning of fuel.Explanation:Nitric acid, HNO3, is a powerful oxidising agent.It readily supplies oxygen to support rapid combustion in rocket engines.The other options, CH3COOH, H2SO4, and HCl, do not act as oxidisers for rocket fuel.Therefore, the correct option is A.Answer:A. HNO3