Passage: Read the given passage and answer the questions that follow. The idea of ghosts has captivated people's imaginations for generations, inspiring both dread and curiosity among individuals from all walks of life. Ghosts are commonly thought of as the ghosts of people who have passed away and are either unable or unwilling to leave the places they visited during their lifetime. Both believers and sceptics are drawn to these apparitions, which are said to haunt homes, cemeteries and other places. Sceptics contend that ghost sightings are only illusions brought on by natural elements like light, fog or the mind's perceptions of sounds and shadows, despite the fact that some people are adamant about their presence and attribute them to the spirits of the dead. Using tools like infrared cameras and electromagnetic field detectors, paranormal investigators attempt to record spectral evidence, but the scientific community is not convinced. People are nonetheless fascinated by ghost stories and haunted places despite the absence of concrete evidence, and they frequently visit these places in quest of thrills and a close encounter with the paranormal. Whether one believes in ghosts, this attraction may be more a result of the desire to solve riddles that are outside the realm of our typical comprehension than it is of a belief in the paranormal. Question: According to the passage, what is the key reason people are still drawn to ghost stories?

1. They have an unquestioning belief in ghosts.
2. The secrets of the unknown excite them.
3. They want scientific evidence of ghosts.
4. They aim to refute reports of ghost sightings.