The correct answer is choice "D" - not enough information.  Why?  We cannot know about someone's language teaching ability, skill level, or intelligence level by looking at them.  Certainly, skin color, eye color, hair color, et cetera, can't tell us about a teacher's education, experience, or ability to care about the students' education.  Please remember that when choosing a teacher.   

     As we say in America,  "Don't judge a book by it's cover."