Which Statement Best Describes Our Current Understanding of the Relationship

Which statement best describes our current understanding of the relationship between CO₂ levels and photosynthetic activity?

A) Increasing CO₂ levels will result in a sustained increase in photosynthetic activity in both herbaceous plants and forest trees.
B) Increasing CO₂ levels will result in a sustained decrease in photosynthetic activity in both herbaceous plants and forest trees.
C) Increases in photosynthesis rates due to increases in CO₂ levels are likely to be short-lived for some herbaceous plants, but may be more sustainable for forest trees.
D) Increases in photosynthesis rates due to increases in CO₂ levels are likely to be short-lived for forest trees, but may be more sustainable for some herbaceous plants.

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