In the case of JEB v. Alabama ex rel. T.B. (1994), the Supreme Court ruled that using peremptory challenges to exclude jurors based on gender was unconstitutional. This decision was rooted in the principle that peremptory challenges based on gender constitute unlawful discrimination, violating the Equal Protection Clause of the Fourteenth Amendment rather than the Sixth Amendment.
Given the options provided, the most accurate response would be:
Peremptory challenges on the basis of gender were a violation of the Sixth Amendment.
However, it's important to clarify that the primary basis for the ruling was more closely related to the Equal Protection Clause than the Sixth Amendment itself, which guarantees the right to a fair trial. The ruling in this case expanded upon previous decisions regarding the use of peremptory challenges and helped reinforce the principle that juror discrimination based on gender is not permissible in the selection process.