Stirling and Drake's Conducted Experiments About the Effects of Elevated

Stirling and Drake's conducted experiments about the effects of elevated atmospheric carbon dioxide on insect herbivory.What did they conclude about the effect of elevated CO₂ on plant growth and herbivory?

A) Higher plant growth,but no change in insect herbivory.
B) No change in plant growth,but higher herbivore densities.
C) Higher plant growth,but reduced herbivore densities.
D) Higher plant growth and herbivore densities.
E) No change in plant growth,but increased herbivore density.