The first formed primary phloem is referred to as $A$. The later formed primary phloem is referred to as $B$. Choose the correct combination of $A$ and $B$.

  • A
    $A$-protoxylem,$B$-metaxylem
  • B
    $A$-protophloem,$B$-sieve tube cells
  • C
    $A$-metaphloem,$B$-sieve tube cells
  • D
    $A$-protophloem,$B$-metaphloem

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