Choose the best topic sentence from the four options below.
A
Apart from the local economy, we should also consider the environment when talking of tourism.
B
Some tourists leave waste and make noise, which seriously disturbs animals and local inhabitants.
C
Touring by car will produce many poisonous and harmful gases, such as carbon dioxide and nitrogen dioxide.
D
Tourism is one of the biggest industries of our time and is generating around 9.5% of the world's total GDP.
