Answer:
C. Determining the party's position on controversial foreign policy issues.
Step-by-step explanation:
A, B, and D are incorrect because they specifically mention voters, a governor, and a school district. These all assume that the topic is local or held within a state. A national political party deals with topics on a national scale. A foreign policy assumes that it is international and a national party political party would stand with or against certain policies. Therefore, C is correct.