01 Which area was most directly affected by the creation of a unified national market?
Answer and explanation
Correct answer: A. Trade
Explanation: The governing concept is economic integration through a common national market. When internal customs barriers and different regional restrictions were reduced, goods could move more freely across the territory. This directly changed the conditions of buying, selling, production, and distribution, so trade was the area most immediately affected. Option A is correct. Hereditary rule, royal worship, and foreign invasion are political, cultural, or military matters rather than the direct economic function of a unified market.