The most accurate response to the question "How were literacy tests used to disenfranchise voters?" is:
They disqualified people from registering to vote based on the administrator's interpretation of the person's answers.
This reflects how literacy tests were often applied subjectively, allowing administrators to unfairly fail individuals, particularly those from marginalized groups, effectively disenfranchising them. While the other options contain elements related to disenfranchisement, the subjective nature of test administration was a particularly significant factor in the disenfranchisement of Black voters and others during that era.