Is this meant to be a question?
Boost the tourist trade always favors aviation. You have to get to a foreign country somehow. D is not the answer.
Creating wealth is not a hindrance to any industry. So A is incorrect.
B is kind of tough to get rid of. If aviation is already there you don't want to compete with an established industry. It is wrong only because C is a better choice.
Answer. C.
D and B are wrong of the back, and how would crossing your arms help you?
The answer is C. Repeating the words because you can practice reading the words and it can help you when you go to present.