The answer to the question is option 'A': The talking fan was mysterious because it always tried to speak something with others that no one knows. Let's discuss this answer in detail.

The talking fan was indeed mysterious because it possessed the ability to communicate with others in a way that was unknown to everyone. This unique characteristic made it stand out and created an air of intrigue and fascination around it.

- The fan's unique aspect:
The talking fan's ability to communicate set it apart from regular fans, which typically do not possess such capabilities. This peculiar feature caught people's attention and made them curious about how and why the fan could talk.

- Unknown messages:
The fan would often try to convey messages, but nobody could decipher their meaning. These messages were enigmatic and held a certain mystery. People were puzzled about where the fan's messages originated from and what purpose they served.

- Intrigue and curiosity:
The fact that the fan had the ability to talk sparked intrigue and curiosity among people. They were fascinated by the idea of an inanimate object possessing such a unique ability. This led to speculation and discussions about the origins and nature of the fan's communication.

- Unanswered questions:
Since nobody knew the source or meaning of the fan's messages, it remained a mystery. People were left with unanswered questions, which added to the air of mystery surrounding the fan. They wondered if there was a hidden mechanism inside the fan or if it had some sort of supernatural power.

In conclusion, the talking fan was mysterious because it possessed the ability to communicate with others in a way that no one could understand. This unique quality sparked intrigue, curiosity, and speculation among people, leaving them with unanswered questions and a sense of wonder.