Final answer:
The word 'conjecture' means 'guess.' It is not a fact, opinion, or assumption, but rather a tentative explanation or guess based on available evidence.
Step-by-step explanation:
The word 'conjecture' means 'guess,' so option 4) Guess is the correct answer. Conjecture is a term used when there is uncertainty or speculation about something. It is not a fact, opinion, or assumption, but rather a tentative explanation or guess based on available evidence. For example, if someone says, 'It's just a conjecture, but I think the weather will be sunny tomorrow,' they are expressing a guess or speculation.