从植物花中可提取一种简写为HIn的有机物，它在水溶液中因存在

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从植物花中可提取一种简写为HIn的有机物，它在水溶液中因存在下列平衡：
HIn（溶液，红色）H⁺(溶液，无色)+In^-(溶液，黄色)而用作酸碱指示剂。往该溶液中加入足量Na₂O₂粉末，则溶液颜色为（）

A．红色变深

B．黄色变浅

C．黄色变深

D．褪为无色

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