Limiting Factor's question!

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http://www.xtremepapers.net/CIE/Cambrid ... 4_qp_1.pdf

Hello, can anyone please explain me the answer of question number 6? The limiting factor is a factor which limits the rate of photosynthesis. So, in this question when light intensity increases, the photosynthesis still carries on which means that carbon dioxide should be the limiting factor? :?
 
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