Which graph illustrates the expected changes in a chloroplast's stroma pH in response to a cycle of light and dark?

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The expected changes in stroma pH in response to a cycle of light and dark is shown by graph B. This graph shows an increase in pH during the light-dependent reactions when protons are pumped into the thylakoid space, followed by a decrease in pH during the light-independent reactions when ATP and NADPH are used in the Calvin cycle to produce organic molecules. This cycle is repeated during each cycle of light and dark, resulting in oscillations in stroma pH.

Which Graph Illustrates the Expected Changes in a Chloroplast's Stroma