Concept:Private enterprises survive best when government creates a favourable environment, such as publicity and tax relief.Explanation:Private enterprises need support such as advertising (promoting) their products overseas, which opens foreign markets, and giving them tax exemptions to reduce their costs.Controlling them strictly or forcing them to pay taxes alone would not help their survival.Therefore, option A best describes the kind of support the government should give.Answer:Option A (advertising the products of private enterprises overseas and providing tax exemption)