83. The table below shows how total donations, average donations, total labor costs and average labor costs vary depending on the number of employees State U hires for its fundraising activities. Number of Total Average Total Average Employees Donations Donations Labor Costs Labor Costs $30,000 $8,000 N $42,426 $17,000 $17,321 $27,000 $60.000 $9,500 5 $13,416 $50,000 The marginal benefit (in terms of extra donations) of the 2nd employee is: A. $42,426. B. $21,213. C. $12,426. D. $11,337