Answer: The correct answer is "Voluntourism is a worthwhile way to make a difference and travel the world.
Explanation: The claim throughout the article is that while those who "voluntour" think they are making a difference by their efforts, there are a wealth of problems that occur because of their presence. The essence of the article (or claim) is that "voluntourism" is not really a good thing. Thus, the counterclaim is the choice listed.
It is place because it is not saying a specific time.
Its saying basically that there are hidden secrets underneath people. That every smile, nod or wave has a hidden agenda. It's like warning to be wary of who you trust.