(Table) According to the table, in a two-person market that includes person A and person B, the willingness-to-pay for the second doughnut is

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Looking at the table, we can see that person A has a willingness-to-pay of $4 for the first doughnut and person B has a willingness-to-pay of $6 for the first doughnut. Since the first doughnut costs $3, both A and B will purchase one. 
For the second doughnut, person A's willingness-to-pay is only $2 while person B's willingness-to-pay is $5. Therefore, the maximum price that both are willing to pay for a second doughnut is $5. Since the cost of producing the doughnut is $2, the seller can charge up to $5 while still making a profit. Therefore, the best choice would be C, $6.

(Table) According to the Table, in a Two-Person Market That