In 2019, Upwards of Twenty Candidates Announced Their Intentions to Run

In 2019, upwards of twenty candidates announced their intentions to run for president in 2020 for the Democratic Party. Once a candidate has emerged as a clear frontrunner in 2020 after the primaries, the Democratic Party will mobilize its resources at the national level to form a platform and agenda for the candidate, and supporters at the state level will begin grassroots efforts for the candidate's campaign. What are the Democratic Party's actions an example of?

A) contesting the presidential election
B) providing organization for the operation of government
C) developing a framework for voters to make choices
D) selecting leadership in the federal government