The correct option is B
It's a falsehood
Explanation:
A conjecture is a form of declarative statement or proposal that is guessed as being correct or the truth based on the available evidence that contributes to the correctness of the statement but is yet have a disproof or proof.
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Therefore, a conjecture can be correctly the truth, a declarative statement based on observation or a question but not a falsehood because then it will not be based on any logical supporting evidence.