In which layer is the temperature the lowest

The temperature is lowest at the crust. As you get lower into the Earth's surface, the temperature gets hotter.

Option (D)

Explanation:

The interior of the earth is comprised of different layers. The crust is the outermost layer of the earth and is divided into the continental and the oceanic crust. The thickness of the oceanic crust is about 7-10 km whereas the thickness of the continental crust ranges from 35-40 km.

The density of this crust is the minimum in comparison to the mantle and the core and is about 2.8 g/cm³. This density is quite less due to the decreasing temperature within the crust. As the depth increases, density increases. Therefore, the temperature also extensively increases.

The temperature is the maximum in the inner core and the minimum in the crust.

Thus, the correct answer is option (D).