Which group of mineral elements is important in the maintenance of $pH$?

  • A
    $Na^+, K^+, Ca^{+2}$
  • B
    $Na^+, Cl^-, Ca^{+2}$
  • C
    $Na^+, K^+, Cl^-$
  • D
    $Na^+, Cu^{+2}, PO_4^{-3}$

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