1 – Wrong
Even though the text mentions pressure groups, we cannot be certain that some people’s opinions have been influenced by them.
2 – Correct
Some people clearly are mistaken. 40% of the people think that air travel contributes more to air pollution. However, that is certainly wrong as the statistics given in the first line clearly tell the opposite story.
3 – Correct
The last line proves this sentence correct. 47% think that air travel should be limited. However, only 15% are ready to travel less often. This means that 32% think that air travel should be limited but they do not want to travel less often.
Since statements 2 and 3 are correct, E is the answer.