[单项选择]Plant guard cells(保卫细胞) have a higher [C1-] than the outside environment. The most likely explanation for this is( ).
A. Water leaves the cell by osmosis.
B. C1- is diffusing through transmembrane channels.
C. C1- diffusion is aided by a mobile carrier.
D. An active transport symport transports C1-/H+.
E. None of the above

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