The core concept here is understanding the purpose of visualizing the end of a dream as mentioned in the text. The direct evidence from the text suggests that visualizing the end of a dream is aimed at controlling its course. This is supported by the instruction to 'wake up just enough to control its course.' Option A is incorrect because the text does not suggest forgetting the dream as a purpose. Option C is contrary to the text's implication that this method is a way to manage dreams, not to increase anxiety. Option D is a misinterpretation, as seeking help from a therapist is recommended for those suffering from persistent nightmares, not for visualizing the end of a dream.