B is the correct answer.
Federal district courts act primarily as the Court of original jurisdiction for the Federal Court system (with some key exceptions). As a result, the lower courts are responsible for charging and trying defendants for violations of federal law and build out the record that appellate courts consider when and if they hear a case.
The major role district courts play in the federal judiciary is charging and trying defendants for breaking the federal laws.
District courts help in resolving disputes by determining the facts and applying legal principles.
The major role district courts play in the federal judiciary is charging and trying defendants for breaking federal laws.
Therefore, B is the correct option.
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