What circumstances is most likely to prevent a person from being able to understand the Miranda warning?

The most relevant circumstance that can significantly hinder a person's ability to understand the Miranda warning is language problems. The Miranda warning is typically delivered in English, so if a person does not comprehend English or has limited proficiency, they may struggle to grasp the rights and implications being explained to them. This can lead to confusion about their legal rights, such as the right to remain silent and the right to an attorney.

While factors like level of education, gender, and occupation could influence a person's comprehension to some degree, language barriers present a more immediate and critical obstacle. Effective communication is essential in legal contexts, and if the individual cannot understand the language in which the warning is given, the purpose of the Miranda warning is defeated.