Answer:
This is hard to answer. Today's political parties are so divided that they definitely do not encourage citizens to remain open to all viewpoints rather than taking partisan stances, so D is out. I would also say B is out, because they don't convince citizens to ignore national issues at all. That leaves us with A and C. Because the parties are so divided, they are constantly challenging the two party system. That is just a fact. However, my instinct tells me they are looking for answer C to be the correct answer, because it sounds politically correct, which is how the parties portray themselves. By making it easier for voters to identify candidates who share their general beliefs and values. And my fingers are crossed that this is the answer they want.
Step-by-step explanation: