What did a snake charmer learn from his elders?

A snake charmer is a person who displays his prowess in controlling a snake for entertainment purposes. According to the chapter, he learns various kinds of knowledge from his elders. He learns from his seniors how to play the been properly so that the melody can make a snake dance, how to remove a snake's poisonous teeth or fangs and how to make medicines using plants from forests. So the correct option is D, all of the above.