Burning fossil fuels releases oxides of sulfur and nitrogen. these air pollutants can be responsible for i) the death of fish in lakes ii) precipitation with a ph as low as 3.0 iii) eutrophication of lakes

i) the death of fish in lakes

ii) precipitation with a ph as low as 3.0

Explanation:

Burning fossil fuels releases oxides of sulfur and nitrogen into the atmosphere. The release of this air pollutants can result in the death of fish in lakes, and in precipitation with a ph as low as 3.0.

Acid is formed in water bodies such as lakes when the air pollutants dissolve in water vapor. There is condensation of the acidic water vapor into the clouds, and it will later fall as precipitation (with a ph as low as 3) such as acid rain. The acid rain will eventually enter water bodies and make the water bodies to be more acidic. Acidic environment is harmful to aquatic organisms such as fishes and it can lead to their death.  

c. earths continental crust is thicker than its lithosphere.

because, the lithosphere is the outermost layer of the earth/ 100 km thick and is defined by its machanical properties.the lithosphere contains oceanic and continental crust that varies in age and thickness across locations and geologic time. the lithosphere is the coolest layer of the earth in terms of temperature. the term lithosphere should not be confused with the use of "geosphere" which is used to indicate all of earth systems, including the atmosphere, hydrosphere   and biosphere. the surface of the earth can be divided into the continental crust and the oceanic crust.   the continental crust is made mostly of granite while the oceanic crust is made of basalt. the average thickness of the continental crust is 25 miles and the average thickness of the oceanic crust is 5 miles.   three types of rock, igneous, sedimentary, and metamorphic, make up the surface of the earth. that's why 3 option is preferable.