Which statement best explains why a Supreme Court opinion is a seminal document? An opinion can become quite lengthy, which makes it a seminal document. Supreme Court documents are the only seminal documents in the United States. An opinion may create major changes in the laws or policies of the United States. Generally speaking, a Supreme Court opinion reflects the feelings of all Americans.

The correct option is : an opinion may create major changes in the laws or policies of the United States.

By definition, a seminal U. S document is a fundamental text which serves as a basis for taking further important decisions. A seminal document has profound importance within the country democratic system and also may have historical and/or literary relevance. For instance, the Constitution, Roosevelt's Four Freedoms speech, and the Bill of Rights are examples of seminal documents.

In this case, a Supreme Court opinion will most probably have a great impact on further changes in the laws and policies to be made.