Answer :
Option d is correct. An argument is valid, but one of its premises is false. The term that best describes the argument is unsound.
An faulty argument or a good argument with at least one erroneous premise is both examples of unsound arguments. A valid argument is one in which all of the premises are true. Obviously, the conclusion is accurate. Saying that an argument is sound means that it is "excellent" and that the conclusion should be accepted.
A method of evaluating an inference from premises to conclusion is to consider its validity. In addition to the argument's validity, soundness adds the second consideration of whether or not the premises are true. Sound = True Premises + Validity. Consequently, it is unsound to use a valid argument with one or more erroneous premises (not sound).
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