Which of the following factors explains the need for international trade I. variation in technology II…

Step 1: Analyze the question The question asks which factors explain why countries need to trade with one another. International trade exists because countries are not equal or self-sufficient.

Step 2: Explain the concept Countries trade because of:

• Differences in natural resources: Nigeria has crude oil, Ghana has cocoa and gold, Japan has few raw materials. Each country gets what it lacks from others.
• Differences in technology and skills: Some countries manufacture machines, vehicles, and electronics. Others cannot, so they import them.
• Differences in climate, labour, and capital (not listed here, but also relevant).

Step 3: Evaluate each statement

• I. Variation in technology: ✅ Valid. Countries with advanced technology produce goods that others cannot, which creates demand for trade.
• II. Uniformity in taste of goods: ❌ Not valid. If everyone had the same taste, there would be less reason to exchange. It is variety or differences in taste that encourages trade, not uniformity.
• III. Language barrier: ❌ Not valid. This is an obstacle to trade, not a reason for it.
• IV. Difference in natural resources: ✅ Valid. This is the classic reason for international trade.

Step 4: Identify the answer The correct statements are I and IV only, which is option D.

Tip: For "why countries trade" questions, look for the word difference or variation (resources, climate, technology, skills). Be wary of words like "uniformity," "similarity," or "barrier," which usually point to wrong options.