The disjunction of three sentences is false O if and only if at least one of the sentences is false. O if and only if at least two of the sentences are false. O if and only if all three sentences are...

Extracted text: The disjunction of three sentences is false O if and only if at least one of the sentences is false. O if and only if at least two of the sentences are false. O if and only if all three sentences are false. O under no circumstances, because a disjunction can't be defined for more than two sentences.