The dual approach to the consumer's problem is to choose:

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The dual approach to the consumer's problem is also known as the cost-minimization problem. It involves finding the least-cost budget line required to achieve a given level of utility (satisfaction). This is the optimal choice because it focuses on minimizing the cost of achieving a given level of utility, which is what consumers are typically concerned with. Option A is not necessarily optimal because the highest indifference curve that just touches the budget line may not be the most cost-effective option. Option C is not relevant to the consumer's problem as it focuses on the maximum income required, which is not a decision variable for the consumer.

The Dual Approach to the Consumer's Problem Is to Choose