20. Pretzels can cause cavities. Interestingly, the longer that a pretzel remains in contact with the teeth when it is being eaten, the greater the likelihood that a cavity will result. What is true of pretzels in this regard is also true of caramels. Therefore, since caramels dissolve more quickly in the mouth than pretzels do, eating a caramel is less likely to result in a cavity than eating a pretzel is.
The reasoning in the argument is vulnerable to criticism on the grounds that the argument
(A) treats a correlation that holds within individual categories as thereby holding across categories as well
(B) relies on the ambiguous use of a key term
(C) makes a general claim based on particular examples that do not adequately represent the respective classes that they are each intended to represent
(D) mistakes the cause of a particular phenomenon for the effect of that phenomenon
(E) is based on premises that cannot all be true