The question focuses on identifying the factors that have increased people's anxiety as mentioned in the text. The text explicitly lists terrorism, economic uncertainties, and general feelings of insecurity as the causes of increased anxiety, making option B the correct answer. Option A is incorrect because the text does not link increased anxiety to paying attention to dreams. Option C is incorrect as visualizing the end of dreams is presented as a method to control dreams, not as a cause of anxiety. Option D is incorrect because seeking help from a therapist is recommended for those with persistent nightmares, not cited as a cause of increased anxiety.