Final answer:
The correct option is A). Economists recognize infant industry protection as a valid argument for protectionism to allow new industries to grow and eventually compete in global markets.
Step-by-step explanation:
Among the given arguments regarding the need for protectionism, the one recognized as valid by economists is infant industry protection to foster initial growth. The infant industry argument suggests that new industries may require temporary protection from international competition until they develop the skills, management, technology, and economies of scale needed to compete effectively in global markets. This approach has been successful in some cases, notably in East Asia, although it's also noted that often 'infant industries' don't manage to become competitive without continuous protection. Economists generally argue for a temporary period of protectionism, which should be intended as a way to orient industries toward future market competition rather than establishing a pattern of unending subsidies and trade protection.