Folding problem

[greenteeth]

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How to work on this folding question 😕 I am having trouble to figure it out. The answer is B. Thanks~

 

[YYC]

You will get a proper folding of the cube with the correct shaded regions that matches answer choice B exactly if you use the the second shaded side/face on the top end of the flatten cardboard box counting from right to left as the side face towards you displayed by choice B.

 

[greenteeth]

Thanks. I got it now 🙂