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Photosynthesis requires light and the light turns carbon dioxide into water and sugar.  

So the brighter or the longer the light shines, the lesser carbon dioxide remains in the air and the lesser light means more carbon dioxide remains in the air.  Since this box is airtight, it means there is no constant fresh air flowing into the box, hence carbon dioxide would only reduce.

Setup A has the weakest lighting  – 1 battery 2 bulbs  => most carbon dioxide 

Setup B  is reasonably lighted up – 2 batteries, 1 bulb  => moderate carbon dioxide

Setup C is a parallel set up, meaning, if one light bulb is blown the other can continue 

Setup D is bright with 3 batteries to 1 bulb

Since there is no D, C, B, A option,  C, D, B, A is the best choice.

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Thank you. God bless you.

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