Final answer:
The number of candidates a state may submit for national office varies by party rules and the office at stake. For presidential elections, states appoint electors equal to their congressional representation. For congressional offices, each state has specific requirements, and usually, one candidate per party runs in the general election.
Step-by-step explanation:
The number of candidates that a state may submit each year for a national office is not uniformly set and can vary depending on specific party rules and the office in question. For example, in the context of presidential elections, each state may appoint a number of electors, equal to the total number of its Senators and Representatives in Congress, to participate in the Electoral College as per Article II, Section 1 of the U.S. Constitution. These electors cast votes for presidential candidates. However, when discussing candidacy for national offices such as the Senate or the House of Representatives, eligibility and the number of candidates are based on each state's individual requirements, which are established at the state level. Each political party may have multiple candidates seeking nomination during the primary elections, but typically only one candidate per party will advance to the general election for each office.