下列各组物质，能共存于同一水溶液的是（　　）

A．MgCl₂、CuSO₄、NaNO₃

B．BaCl₂、Na₂SO₄、Ca（OH）₂

C．AgNO₃、BaCl₂、K₂SO₄

D．CaCl₂、K₂CO₃、NaNO₃

Growing economic problems were highlighted by a slowdown in oil output.

A．accounted for

B．worked out

C．made prominent

D．taken for granted