four choices have P been provided. Select the correct alternative. W Which one of the following...

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four choices have
P been provided. Select the correct alternative.

W
Which one of the following can be used as a box type solar cooker?
(a) A double walled cooker made of plastic and its inner wall is painted white.
(b) A double walled cooker made of copper and its inner wall is painted black.
(c) A double walled cooker made of plastic and its inner wall is painted black.
(d) A single walled cooker made of copper and its both sides are painted white.
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