Which of the Following Best Describes What Scientists the Bell

Which of the following best describes what scientists the Bell research group) concluded about the effect of atmospheric CO₂ increases on phytoplankton's primary productivity?

A) After 1000 generations, phytoplankton will not show an increase in primary productivity.
B) After 1000 generations, phytoplankton showed a consistent significant increase in primary productivity.
C) After 1000 generations, phytoplankton showed a consistent significant decrease in primary productivity.
D) After 1000 generations, phytoplankton showed a moderate increase in primary productivity.