Answer:
Black Asphalt < Brown Soil < Beige Sand < White Paper (from smallest to greatest)
Explanation:
The reflectivity here refers to the reflection of light, which is the amount of light that is reflected back when incident on the surface of any particles.
Black asphalts are black colored, viscous liquid form of petroleum that is often used for the construction of roads. It is black in color and is a good absorber of heat.
Brown soil is the brownish colored earth soils that are basically comprised of mineral matters, water, humus, and also some living organisms are found to be present here. These mineral matter are the rock fragments that were formed from weathering and erosion of rocks. They have a low reflectivity of light.
Beige sand are the reddish-brown colored feldspar particles that can absorb as well as release heat up to some extent.
White papers are good reflectors of light because of its light white color that enables the incident light to reflect back into the atmosphere.
Thus, the reflectivity of the materials are given below in the increasing order as-
Black Asphalt < Brown Soil < Beige Sand < White Paper.
