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Which of the following cations cannot be separated by adding \( \mathrm{NH}_{4} \mathrm{Cl}, \mathrm{NH}_{4} \mathrm{OH} \) and \( \left(\mathrm{NH}_{4}\right)_{2} \mathrm{CO}_{3} \) to their solution ?
(A) \( \mathrm{Ca}^{2+} \) and \( \mathrm{Sr}^{2+} \)
(B) \( \mathrm{Ba}^{2+} \) and \( \mathrm{Sr}^{2+} \)
(C) \( \mathrm{Ba}^{2+} \) and \( \mathrm{Mg}^{2+} \)
(D) \( \mathrm{Ca}^{2+} \) and \( \mathrm{Ba}^{2+} \)
(UV)
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