Which of the following is an appropriate thesis statement?

Question 9 options:

Knowing a foreign language is a very useful skill that can help one advance in a career, relate better to others, and open one's mind to the ideas of another culture.


I think that learning a foreign language is the best thing I have ever done, and I think everyone should learn a second language.


Why should people know a foreign language?


My project is going to tell about the importance of knowing a foreign language.