Use the Table Below to Answer the Following Questions

Use the table below to answer the following questions.
Table 18.2.2
Wendy owns an apple orchard and she employs students
to pick the apples. In an hour they can pick the following amounts:

-Refer to Table 18.2.2. If the price of apples is $0.50 per kilogram, the value of marginal product of the 5th student is

A) $0.50 an hour.
B) $72.50 an hour.
C) $14.50 an hour.
D) $12.50 an hour.
E) $10 an hour.