What is the length of term for a Supreme Court Justice?

The length of term for a Supreme Court Justice is indeed for life, which reflects the constitutional principle that justices are appointed to serve "during good behavior." This lifetime appointment is intended to ensure judicial independence, allowing justices to make decisions based on their interpretation of the law without the influence of political pressure. The framers of the Constitution established this concept to promote a stable judiciary free from the need for justices to seek reappointment or elections, which could hinder their objectivity.

In contrast, the other choices suggest fixed terms, which do not align with the actual provisions in the U.S. Constitution. The idea behind lifetime appointments is to provide justices with the security needed to uphold the law impartially over time.