In the case of JEB v. Alabama ex rel. T.B. (1994), the U.S. Supreme Court ruled that the use of peremptory challenges based on gender constituted a violation of the Equal Protection Clause of the Fourteenth Amendment. The case involved a dispute over child support, where the prosecutors used peremptory challenges to exclude men from the jury pool.
The most likely reason the justices ruled as they did is:
Peremptory challenges on the basis of gender were a violation of the Sixth Amendment.
While the issue was primarily framed within the context of equal protection under the law rather than focusing solely on the Sixth Amendment right to a fair trial, the ruling emphasized that excluding jurors based on gender is discriminatory. Therefore, the correct answer should actually address the violation of the Equal Protection Clause rather than directly link it to the Sixth Amendment, but the closest option provided is the one regarding the violation of peremptory challenges based on gender.