What is the consumer's optimum consumption point?

• A. The point where the consumer's budget constraint intersects the origin.
• B. The point where the consumer's budget constraint is perpendicular to the indifference curve.
• C. The point where the consumer's budget constraint is parallel to the indifference curve.
• D. The point where the consumer's budget constraint is tangent to the highest attainable indifference curve.

Answer: (D)