can i have a answer for this question?

Short Run Production Functions 260 MD 1.00 240 220 Total 200 180 - Product ! 160 Total Pr 140 120 100 80 60 40 20 01 2 3 4 5 6 7 8 9 1011 12 13 14 15 Units of Labour Marginal Product, Average Product -Marginal:- Product - Average : Product 0 1 2 3 4 5 6 7 8 9 1011 1213 14 15 Units of Labour FIGURE 7-1 Refer to Figure 7-1. If the firm hires the 15th unit of labour, A. output will increase by 2 units of output. O B. average product will rise. O C. the firm will reach its capacity. O D. marginal product will be unchanged. O E. the extra output will be zero