The correct answer is: Only argument I is strong.
Argument I is strong because it is based on the idea that if everyone cooperates, pollution can be controlled. This is a logical argument, and it is supported by evidence. For example, we know that pollution has been reduced in some areas where people have worked together to clean up the environment.
Argument II is weak because it is based on the idea that pollution is caused by certain factors that are beyond control. This is not a logical argument, because it is possible to control these factors. For example, we can reduce the number of cars on the road by building more public transportation. We can also reduce the amount of pollution from factories by requiring them to install pollution controls.
In conclusion, only argument I is strong.