将15mL2mol·L－1Na2CO3溶液逐滴加入到40mL

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将15 mL 2 mol·L^－¹ Na₂CO₃溶液逐滴加入到40 mL 0.5 mol·L^－¹ MCln盐溶液中，恰好将溶液中的Mⁿ⁺离子完全沉淀为碳酸盐，则MCln中n值是

A．4

B．3

C．2

D．1

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