Read the following paragraph and answer the questions given below:Some of the most important reactions involving the Lewis and Bronsted acidity of inorganic compounds occur at solid surfaces. For example, 'surface acids' which are solid with a high surface area and Lewis acid sites are used as catalysts in the petrochemical industry for the interconversion of hydrocarbons. The surfaces of many materials that are important in the chemistry of soil and natural water also have Bronsted and Lewis acid sites. Silica surfaces do not readily produce Lewis acid sites because -OH group remain tenaciously attached at the surface of SiO_(2) derivatives, as a result Bronsted acidity is dominant. Alumino silicates display strong Bronsted acidity. When surface OH groups are removed by heat treatment, the alumino silicates surfaces possess strong Lewis acid sites. Surface reactions carried out using the Bronsted acid sites of silica gel are used to prepare thin coatings of a wide variety of organic groups using surface modification reactions. Thus, silica gel can be modified to have affinities for specific classes of molecules. Choose the correct option:QDue to availability of Lewis as well as Bronsted sites of natural materials