Answer: Conjecture
Step-by-step explanation:
An unproven statement which is based on only observations is a statement you believe is true based on inductive reasoning and you are able to draw a conclusion from it through a certain pattern. This is known as conjecture.
Conjecture is drawn from a personal opinion about something you notice in which you are able to draw a reasonable conclusion without experiment or without a proof.
So, the best option is conjecture.
