Consumer Surplus Loss in Market Intervention

Steps:

• Identify consumer surplus as the area between the demand curve and the price line up to quantity demanded.
• In a price control or tax scenario, calculate the change by subtracting new surplus from original.
• Label areas: X as transferred surplus (e.g., tax revenue), Y as deadweight loss triangle, Z as producer gain or other.
• Loss to consumers includes transfer to producers/government plus deadweight loss portion affecting buyers.

Why C is correct:

• Consumer surplus loss equals Y only, the deadweight loss triangle, per standard microeconomics definition where transfers (X) are not a net loss to society but reallocation.

Why the others are wrong:

• A: X only ignores the deadweight loss (Y), understating total consumer harm.
• B: X+Y includes transfer (X) as loss, but it's not destroyed surplus.
• D: Y+Z adds irrelevant producer area (Z), not part of consumer loss.

Not enough information on exact graph, but assuming standard labeling.

Final answer: C