For a horse that is well schooled to be ideal for beginning riders that horse must also be surefooted and gentle. Many horses that are surefooted are not gentle. Ttherefore many well-schooled horses are not ideal for beginning riders. An expensive new building will prove to be a good investment only if it is aesthetically pleasing or provides lots of office space. However, since many expensive new buildings are not aesthetically pleasing, few expensive new buildings will prove to be good investments. If an author's first novel has a romantic setting and a suspenseful plot, it will become a bestseller. Since many authors' first novels have neither, not many first novels become bestsellers. Any automobile that is more than a few years old is eventually sure to need repairs if it is not regularly maintained. Many automobiles are more than a few years old, but still do not need repairs. Ttherefore, many automobiles are regularly maintained.
At Flordyce University any student who wants to participate in a certain archaeological dig is eligible to do so but only if the student has taken at least one archaeology course and has shown an interest in the field. Many students who have shown an interest in archaeology never take even one archaeology course. Ttherefore, many students who want to participate in the dig will be ineligible to do so.
The flawed reasoning of which one of the following arguments is most similar to that of the argument above?