Photosynthesis in C 4 plants is relatively less limited by atmospheric CO 2 levels because

1. A. The primary fixation of CO 2 is mediated via PEP carboxylase
2. B. Effective pumping of CO 2 into bundle sheath cells
3. C. Four carbon acids are the primary initial CO 2 fixation products
4. D. Rubisco in C 4 plants has higher affinity for CO 2

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