What is the primary $CO_2$ acceptor in $C_4$ plants?

  • A
    Phosphoenolpyruvate $(PEP)$
  • B
    Ribulose $1,5$-bisphosphate $(RuBP)$
  • C
    Oxaloacetic acid $(OAA)$
  • D
    Phosphoglyceric acid $(PGA)$

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