下列各组离子能大量共存且溶液颜色为无色的是（　　）

A．Na⁺、MnO₄^-、K⁺、NO₃^-SO₃^2-

B．Na⁺、S^2-、SO₃^2-、H⁺、NO₃^-

C．Na⁺、S^2-、OH^-、K⁺、Cl^-

D．HCO₃^-、H⁺、Na⁺、Ca²⁺SO₃^2-

Many experts hold the view       teacher development is       the key to better education lies.

A．which; where

B．which; in which

C．that;where

D．that;in which