What Is the Major Responsibility of the County Chair and the Executive

What is the major responsibility of the county chair and the executive committee in Texas political parties?

A) They are responsible for raising funds for their party's political convention.
B) Persons are chosen to be sent to the state convention by the county chair and executive committee.
C) They are responsible for the organization and management of the primary election in their county.
D) Persons who will serve as precinct chairs are chosen by the county chair and executive committee.
E) They vote to approve candidates for statewide office.