|A) it absorbs sun's rays||B) it reflects sun's rays|
|C) it retains the heat inside by the green house effect||D) it rediates heat better than metals|
Answer: C) it retains the heat inside by the green house effect
As the inside of the cooker is painted black, heat absorption is more producing heat waves of longer wavelength which cannot escape through glass and hence are trapped inside. Thus the food is cooked.