A portion of the graph 'Rate of photosynthesis vs. Light intensity' is labelled 'A'. What causes 'A'?

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A portion of the graph 'Rate of photosynthesis vs. Light intensity' is labelled 'A'. What causes 'A'?<br><img src='https://www.fatskills.com/images2/botany-online-quiz-q7.png' alt='Light intensity diagram' width='270' height='230' class='303056' />