Stomata Open When the Flow of

Stomata open when the flow of

A) potassium ions in guard cells increases from neighboring epidermal cells across the cell membrane.
B) potassium ions in guard cells decreases from neighboring epidermal cells across cell the membrane.
C) hydrogen ions in guard cells increases from neighboring epidermal cells across the cell membrane.
D) sodium ions in guard cells increases from neighboring epidermal cells across the cell membrane.