GMAT Critical Reasoning (CR) | Re: All intelligent people are nearsighted

All intelligent people are nearsighted. I am very
nearsighted. So I must be a genius.
Which one of the following exhibits both of the
logical flaws exhibited in the argument above?
(A) I must be stupid because all intelligent people
are nearsighted and I have perfect eyesight.
(B) All chickens have beaks. This bird has a beak.
So this bird must be a chicken.
(C) All pigs have four legs, but this spider has eight
legs. So this spider must be twice as big as any
pig.
(D) John is extremely happy,