13) E

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.

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