1 – Correct
The writer gives us numerous reasons as to why pop stars and celebrities should not promote awareness. However, if they are more influential than other people, than they should be the ones to do so. So this poses a challenge to the position taken by the writer.
2 – Wrong
Artists becoming more aware of themselves and raising more awareness does not necessarily challenge what the writer says.
3 – Wrong
Artists being paid was not one of the reasons why the writer takes such a position. The writer says that artists do a lot of things which contribute to damage done to the environment. So this does not pose a challenge to what the writer says.
Since only statement 1 is correct, A is the answer.