For Which Argument Below Are the Premises Independent

For which argument below are the premises independent?

A) Premises: The river's water level is falling.Fish require a high water level.Conclusion: The river's fish are endangered.
B) Premises: It is not safe to smoke around an oxygen tank.Your friend is smoking near that oxygen tank.Conclusion: You should tell your friend to move away from the tank.
C) Premises: The newspaper should cover all important stories.The election is an important story.Conclusion: The newspaper should cover the election.
D) Premises: My mother says I have a nice smile.My father says I have a nice smile.Conclusion: I have a nice smile.
E) Premises: Yoga is very relaxing.Relaxation would improve my heart health.Conclusion: Yoga would improve my heart health.