Which of the Following Statements Best Describes the Idea Behind

Multiple Choice

Which of the following statements best describes the idea behind the Carbon Assimilation Experiment on board the Viking landers?

A) living organisms in the soil should incorporate carbon from atmospheric gases
B) radioactive gases should be produced when radioactive nutrients are added to a soil sample
C) soil with living organisms in it should contain organic molecules
D) living organisms in the soil should give off gases when they metabolize nutrients