Based on the information provided in this figure, what event contributes directly to the creation of a proton gradient across the thylakoid membrane? 
Definitions:
CPI
Consumer Price Index, a measure assessing the average change over time in the prices paid by consumers for a basket of goods and services.
Projective Tests
Types of personality tests in which individuals are presented with ambiguous stimuli and their responses are interpreted to uncover underlying thoughts, feelings, and traits.
Direct Observation
Assessment in which the professional observes the client engaged in ordinary, day-to-day behavior in either a clinical or natural setting.
Interviews
A method of gathering information through direct communication involving conversational exchange.
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