$A$ are structures present in the epidermis of leaves. They regulate the process of transpiration and $B$ exchange. It is composed of two bean-shaped cells known as $C$ cells.
Choose the correct combination of $A, B$ and $C$ from the following options:

  • A
    $A-$ Stomata,$B-$ gaseous,$C-$ guard
  • B
    $A-$ Stomata,$B-$ gaseous,$C-$ subsidiary
  • C
    $A-$ Stomata,$B-$ water,$C-$ subsidiary
  • D
    $A-$ Stomata,$B-$ water,$C-$ guard

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