The correct option is C Conventional approaches should be open to questioning and reevaluation
In the fourth paragraph of the passage, the author states that though she had been trained in acting through a certain method, when she herself began teaching, she found loopholes in it and found that the method was limited. She later says that she wants to develop an alternative. Through this she reveals herself to be someone who believes that conventional approaches should be open to questioning and reevaluation. Thus C is the best answer. The other choice are incorrect because they do not fit into the context.