Movement into and out of cells — practice question

What occurs when carbon dioxide is carried by red blood cells?

• AHydrogencarbonate ions move into the red blood cells and chloride ions move into the plasma.
• BChloride ions move into the red blood cells and bind to haemoglobin.
• CChloride ions move into the red blood cells and hydrogen ions move into the plasma.
• DChloride ions move into the red blood cells and hydrogencarbonate ions move into the plasma.