Which of the following is false about the power of courts?

Which of the following is false about the power of courts?a-Courts are not absolutely bound to favor one technique of statutory interpretation over another. b- Courts can distinguish prior decisions in common law cases. c-State Supreme Courts can overrule their own prior decisions. d-Trial courts can decide abstract propositions of law even though there is no real case or controversy between existing parties with a tangible stake in the outcome of the controversy.