Which of the following roles do political parties play in elections?

Political parties primarily serve as organizations that select and endorse candidates for public office, which is a crucial role in the electoral process. This function is significant because it helps to provide voters with clear choices during elections. Political parties assess potential candidates, often conducting primaries or caucuses to determine who will represent the party in a general election. This process not only enables parties to shape their platform and policy agendas but also influences the political landscape by determining which candidates have the best chance of winning and aligning with the party's values and goals.

The other options do not reflect the primary roles of political parties in elections. Judicial review pertains to the power of courts to evaluate laws and their adherence to the constitution, rather than a function of political parties. Establishing taxation policies and promoting foreign policies are governmental functions that involve broader legislative processes and executive decisions, rather than being the direct responsibility of political parties. While parties may influence these policies through their elected officials and party platforms, their primary function during elections is indeed selecting candidates.