When you are anxious, the perceived threat potential of stimuli related to your anxiety can rise. Thus, things you typically encounter that might not usually trigger fear now do so. ____(A)____, if you encounter a snake in the course of a hike, even if no harm comes, anxiety is likely aroused, putting you on alert. If farther along the trail you notice a dark, slender, curved branch on the ground, an object you would normally ignore, you might now momentarily be likely to view it as a snake, triggering a feeling of fear. ____(B)____, if you live in a place where terror alerts are common, harmless stimuli can become potential threats. In New York City, when the alert level rises, a parcel or paper bag left under an empty subway seat can trigger much concern.