Methane in the atmosphere has been generated by many different sources, such as in fossil fuel development and in use, decay of organic matter in wetlands, and byproducts of livestock farming.
A. has been generated by many different sources, such as
in fossil fuel development and in use,
decay of organic matter in wetlands
Non parallel construction of highlighted sections.B. generated by many different fossil fuel sources used in development, and in the decay of wetland organic matter
The given sentence has a subject without a verb and hence is incorrect.C. is generated by many different sources, such as fossil fuel development and use, decay of organic matter in wetlands
The sentence is constructed parallelly and relays the intended meaning.D. has been generated by many different fossil fuel sources, as in development and use, as well as in the decay of organic matter in wetlands
"as well as can be used when we have two pointers, but we have 3 pointers here which leads to methane release. Hence incorrect.E. is generated by many
different fossil fuel sources used in development, decay of organic matter in wetlands
Changes the intended meaning. it means different fossil fuel sources leads to methane generation. Hence C is correct