Which of the Following Statements Best Describes the Idea Behind

Multiple Choice

Which of the following statements best describes the idea behind the Gas Exchange Experiment on board the Viking landers?

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