Use the Table Below to Answer the Following Questions

Use the table below to answer the following questions.
Table 12.2.3

-Refer to Table 12.2.3,which gives the total cost schedule for Brenda's Balloon Shop,a perfectly competitive firm.The marginal cost of increasing production from 4 balloons an hour to 5 balloons an hour is

A) $1.
B) $4.50.
C) $4.70.
D) $4.80.
E) $4.40.