Complete the sentence:
How much of a difference will flattening Mount Blanc make to France.

The correct answer is Option B (It would raise the level of the land by about six inches.).

Key Points:
• Direct textual extraction of factual data and metaphors from the passage.
• In paragraph 1, the author uses an illustrative analogy: "It is said that if you flattened out that great French mountain Mont Blanc, the highest mountain in Europe, and spread it over the whole of France you would only raise the level of the land by about six inches."
• Therefore, Option (2) perfectly completes the sentence.
• Key Takeaway: Flattening Mont Blanc across France would only raise the ground level by about six inches.