During the Presidential Election Process, What Occurs in the Period

During the presidential election process, what occurs in the period from January through June of the year of a presidential election?

A) The candidates declare their intention to seek the office of president.
B) All campaign funds are required to be expended.
C) Primary elections are held in each state to determine the number of delegates each candidate will be allowed to send to the nominating convention.
D) The electoral college meets to cast their formal votes.
E) The nationwide vote is held and the next president is chosen.