The correct answer is Option 1 (The shorter wavelength infrared radiations from the Sun can enter into the greenhouse while longer wavelength infrared radiations from the ground and the plants inside the greenhouse cannot pass back out through the glass).Explanation:A greenhouse is a glasshouse designed to help plants survive in relatively colder climates around the world.The incident solar radiation enters the greenhouse and is absorbed by the plants and surfaces inside, whereas much of the outgoing infrared radiation cannot pass through the glass and remains trapped inside the greenhouse, resulting in warmth.The earth is also referred to as a greenhouse because it absorbs much of the visible spectrum heat from the sun, while greenhouse gases such as carbon dioxide and methane retain some of the infrared radiation emitted by the earth.Since glass is opaque to infrared radiations (thermal region), it partly reflects and partly absorbs these radiations.Greenhouse gases (CO2, CH4, N2O, chlorofluorocarbons or CFCs) allow the solar radiations to enter but prevent the escape of heat radiations of longer wavelength.This mechanism keeps the energy of the sun trapped in the greenhouse.