The correct answer is C) calling for a recount.
The option that is not the function of political parties is calling for a recount.
The political party has many activities such as selecting the candidate for the election, design the platform and conducting the political campaign of the candidate. But calling for a recount is not a part of its functions.
It is the candidate that ask for a recount. This is a resource that is asked when the final count is so close between the candidates. One example of the recount was the famous recount in the state of Florida when Al Gore and George Bush were disputing the "sunny state." The United States Supreme Court ordered to stop the recount that had been initiated.