A de-starched plant was used for the following experiment. A leaf from the plant was partly covered by an object before the plant was placed under the sun for 3 days. The lead was then tested for the presence of starch using iodine solution. The results are shown in the diagram below.

Which one of the following correctly shows what the leaf was most likely covered with for the 3 days before it was tested for the presence of starch?

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