It would be helpful if you included the possible choices as well
A reliable source
An unusual source means it could be wrong, and ancient source could contain incorrect information according to new information known in modern day, and although a source may be relevant, that does not necessarily mean it has correct information; it only means the information is connected to the subject you are researching.
Is this k12 if so I can help you I have already took this
Answer:
I definitely know that the Generals were more powerful
The Mayan civilization created a 365-day calendar.
I hope this helps! :)