Which of the following is a key function of the Supreme Court?

The Supreme Court plays a vital role in interpreting the Constitution, which is a cornerstone of its functions. This involves reviewing laws and decisions to ensure they are in line with constitutional principles, thus protecting individuals' rights and maintaining the rule of law. Through its interpretations, the Court can set precedents that influence future cases and the application of laws across the country.

While the enforcement of laws, conducting trials, and reviewing state laws are important functions within the judicial system, they are primarily carried out by lower courts and other branches of government. The Supreme Court's unique authority lies in its ability to provide definitive interpretations of the Constitution, which can lead to significant legal and social changes. This interpretive function helps to uphold the Constitution as the supreme law of the land and ensures that the principles it embodies are consistently applied throughout the legal system.