Which statement BEST describes how greenhouse gases act as natural insulators in the Earth's system? A) The gases absorb and emit a part of the heat reflected by Earth’s surface. B) The gases receive the Sun’s heat directly and deflect a part of it toward Earth’s surface. C) The gases are formed by the burning of fossil fuels, as a result of which they are very hot. D) The gases react with each other in the presence of sunlight and release energy in the form of heat.