Crunchy Fruits Makes Dried Fruit Snacks

Crunchy Fruits makes dried fruit snacks. Crunchy Fruits has a multi- plant firm with two production facilities. The table abo summarizes the marginal cost of production at the individual plants and the corresponding quantity produced at the individual plants.
-Refer to the table above. What is Crunchy Fruits total marginal cost to produce 9,000 units?

A) $0.50
B) $1.25
C) $2.25
D) $0.75