Final answer:
Nations more involved in foreign trade do not necessarily have predictable trade imbalances, as a multitude of factors can influence a nation's trade balance, making the pattern vary by country.
Step-by-step explanation:
The question of whether nations that are more involved in foreign trade tend to have higher or lower trade imbalances, or if the pattern is unpredictable, is a complex one. According to economic principles, an imbalance between domestic physical investment and domestic saving, which includes government and private saving, will lead to a trade imbalance. This suggests that a nation's level of trade is not directly correlated with its trade balance, as other factors such as a strong tradition of trade, geographical proximity to large trading partners, or large budget deficits can significantly influence these outcomes.
Thus, the answer is that the pattern is unpredictable and varies by country (c). Factors such as national levels of physical investment and savings, budget deficits, encouraging or discouraging trade policies, and the presence of large trading partners can all play a role in determining a nation's trade balance, regardless of the level of trade.