Final answer:
An EA must renew his or her enrollment card on a 2-year cycle.
Step-by-step explanation:
The subject of this question is Business and the grade level is High School.
An EA must renew his or her enrollment card on a 2-year cycle. This means that the EA needs to renew their card every two years in order to maintain their enrollment status.
Therefore, the correct answer is c. 2-year cycle.