A thesis statement is a complete sentence or sentences. A thesis statement is not a question. Which of these is a thesis statement?
Question 2 options: Knowing a foreign language. Why should people know a foreign language? 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.
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 is a thesis statement.