The correct answer is: D. Wrap it in aluminum foil with the shiny side facing outward.
Aluminum foil is a good conductor of heat, which means it can transfer heat away from the object you are trying to keep cool. The shiny side of aluminum foil reflects heat, so if you wrap the object in aluminum foil with the shiny side facing outward, it will reflect the heat away from the object and keep it cool.
The other options are incorrect because they will not help to keep the object cool. Brown paper bags and black paper are both good absorbers of heat, so they will actually make the object hotter. Wrapping the object in aluminum foil with the shiny side facing inward will not help to reflect the heat away from the object, so it will not keep the object cool.