The correct answer is B. They are a non-threatening vehicle for self-expression
Explanation:
Puppets refer to movable figures or models you can manipulate by putting your hand inside. In education, puppets are quite popular in kindergarten and the primary school because these are very useful to teach children, and also allow children to express themselves. This can be explained as puppets are seen as a non-threating vehicle for self-expression, which means you can use puppets to express own thoughts, ideas, tell stories or explain something creatively and from the voice of the puppet. This makes you feel more confident to speak to others and also, makes children or the audience be more interested. Therefore, puppets are powerful learning tools because "they are a non-threatening vehicle for self-expression".