Consider the Following Statements

Consider the following statements:
I.A vertically integrated firm is more dependent on its suppliers than a firm that is NOT vertically integrated.
II.Many firms feel they can control quality better by making their own parts.
III.A vertically integrated firm realizes profits from the parts it is "making" instead of "buying" as well as profits from its regular operations.
Which of the above statements represent advantages to a firm that is vertically integrated?

A) I only.
B) III only.
C) I and II only.
D) II and III only.