Devan has never bothered to be kind to me. Nor has he offered help or companionship. So, since he does not meet any of these basic criteria for friendship, he is my enemy.
Which one of the following exhibits flawed reasoning most similar to the flawed reasoning exhibited in the argument above?The argument says Devan does not meet the criteria for being a friend, and then concludes that he is an enemy.
The flaw is treating “not a friend” as if it means “enemy”. But someone can be neither a friend nor an enemy; he may simply be an acquaintance or a neutral person.
(A) Each officer of this club must be a member of two years standing, or be a committee member, or have special qualifications. Evelyn cannot be an officer, for she has only been a member for one year and is not a committee member.
This is a different flaw. Evelyn might still have special qualifications. The argument ignores one remaining condition.
(B) In order to thrive, this plant needs to be located in a sunny spot and to be watered regularly. So, since this spot is not sunny, and since I did not water this plant regularly, that explains why this plant is not as healthy as it should be.
This is not parallel. The reasoning is basically valid: lacking necessary conditions can explain why the plant did not thrive.
(C) This book has been widely reviewed and hasn't received even one hostile review. Hence we can conclude that, so far, all the critics have loved this book.
This is correct. It treats “not hostile” as if it means “loved.” But a review can be neutral or mildly positive without being loving. This matches the original flaw: treating
not a friend as equivalent to enemy.
(D) A decision in favor of developing the northern border of the town logically implies that it would be equally acceptable to develop the southern, eastern, or western borders. So, it is possible that at least one of these other borders will also be developed.
This is not the same flaw. It moves from acceptability to possibility, not from one opposite category to another.
(E) If everyone were an author, poet, or academic, then society would come crashing to a halt. But most people are not poets or authors. Nor are there many academics in our society. Therefore, our society will not come crashing to a halt.
This is a different conditional flaw. It does not involve assuming that absence of one category means membership in the opposite category.
Answer: (C)