The correct answer is option 1, Pseudomonas. Pseudomonas is a genus of bacteria that is known for its ability to degrade a wide range of organic compounds, including hydrocarbons found in crude oil. These bacteria have naturally occurring isolates that have been further developed through genetic manipulations to enhance their ability to degrade oil spills.
Option 2, Agrobacterium, is a genus of bacteria known for its ability to transfer genetic material into plant cells, but it is not typically associated with oil degradation.
Option 3, Clostridium, is a genus of bacteria that includes various species, some of which are known for their ability to degrade hydrocarbons. However, they are not typically used for treating oil spills.
Option 4, Nitrosomonas, is a genus of bacteria that is involved in the process of nitrification, converting ammonia into nitrate. It is not typically associated with oil degradation.
In conclusion, Pseudomonas is the bacterial strain developed from natural isolates by genetic manipulations that can be used for treating oil spills.