Final answer:
The factor that cannot be used to determine a person's eligibility for voting in North Carolina is education level. Age and citizenship are required eligibility criteria for voting, but gender or education level cannot be used to bar someone from voting. The correct answer is option d.
Step-by-step explanation:
To determine eligibility for voting in the state of North Carolina, one must consider several factors such as age, citizenship, and residence. According to voting regulations, factors that influence voting eligibility typically include being 18 years of age or older, being a U.S. citizen, and fulfilling residency requirements.
In some states, there are also conditions related to competency and not having a disqualifying felony conviction. However, one factor that is not used to determine voting eligibility is education level.
When looking at the factors listed in the question provided: