Political party primaries in Texas (and in other states) are held:.
a. whenever the party believes one is needed.
b. every year well before the general election.
c. in every even numbered year from January or February until the summer months before the general election.
d. in every odd numbered year from January or February until summer months before the general election.
e. 30 days after the general election.

a. whenever the party believes one is needed.

Explanation:

Political party primaries in Texas (and in other states) are held whenever the party believes one is needed

there are no options provided but you can choose among the following gender-neutral pronouns: zir, hir, eir, vis, tem, eir.

in the normal course of maintaining a pronoun-antecedent agreement, we could have used the words his or her but since we are also required to use gender-neutral language, we need to replace it with its equivalent gender-neutral pronoun.