Before ruling on a case, a supreme court justice must consider
(a)precedent.
(b)dissent.
(c)opinion.
(d)defamation.

The correct answer is A) Precedent.

A precedent is an example set by an individual or institution. In this case, the Supreme Court must consider prior rulings and what examples were set in previous courts. This will help the court decide whether the prior precedent needs to be overruled or whether the conflict at hand is similar to one that has already been resolved before.

explanation:

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