Which is the BEST description of the difference between primary and general elections?

A)Primary elections are used by the Democratic Party and general elections are used by the Republican Party.                                                                                        B)Primary elections are used only at the state level and general elections are held only at the national level.                                                                                 C)Primary elections are used to fill seats in the legislative branch while general elections are used to elect officeholders in the executive branch.                            D)Primary elections are held within a party to choose the party’s nominee and a general election allows voters to make the final choice from among the party nominees.