The sentence which is true of the doctrine of res judicata is option B. It bars subsequent civil actions involving the same parties, claims, demands or causes of action in civil law cases.
Civil law is the system of law concerned with private relations between members of a community rather than criminal, military, or religious affairs.
Therefore, the correct answer is option B. It bars subsequent civil actions involving the same parties, claims, demands or causes of action in civil law cases.
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