Context: Instantly she was spun around , camera pointed at her target and a photo instinctively snapped before she even registered what it was . A pair of legs , no body attached . This house was giving her all the comforts of home and more , now was n't it ? She let out a sigh before tucking it away in the hem of her skirt , but her tension only grew as the Camera Obscura continued to emit a blue glow and emit soft sounds .

Question: What 's a possible reason the woman instinctively snapped a photo ?
Options:
0. None of the above choices .
1. Because there was no body attached to the legs .
2. Because she did n't yet register what she was photographing .
3. Because she had only a short opportunity to get the photo .
Answer: 3