Classify the following sentences as N, A, V, or B. In assessing soundness, you may assume commonly known facts.
Correct
ANSWER: B = an argument that is both valid and sound
It is not possible that Sao Paulo is in Brazil, and Brazil in in South America, but Sao Paulo is not in South America. Hence, this argument is valid. In addition, it is true (and commonly known) that Sao Paulo is in Brazil, and Brazil in in South America. Thus, this argument also has true premises, so it is sound.