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Biology question

Biology question

Hi, please can i have help on this question. I don’t understand why the answer isn’t A because if the solution turn from orange to blue black then starch is present so it must have come from the reaction of converting glucose phosphate to starch?
Here is the question: https://app.gemoo.com/share/image-annotation/604497780080750592?codeId=DGapd3a5R7y9o&origin=imageurlgenerator
Thanks!

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