The correct options are
B Metalled roads are constructed with cement, concrete, or bitumen of coal whereas unmetalled roads are natural pathways made primarily of mud.
C Metalled roads can be used in the rainy season, whereas unmetalled roads go out of use in the rainy season.
D Metalled roads consist of road metal whereas unmetalled roads don’t have road metal.
Metalled roads are those constructed with cement, concrete, or bitumen of coal. These roads can be used in the rainy season as well. Thus they are also known as all-weather roads.
Unmetalled roads don’t have road metal. These are either natural pathways or mud roads. They go out of use in the rainy season.