The argument is that “we should not doubt its reliability..examiners are the experts..they all agree that is completely reliable method of identifying criminals”.
A – Wrong
It does not matter whether expert sometimes fail when they try to apply their methods. We are not interested in how they apply their method. This statement is too general and does not relate back to fingerprinting.
B – Wrong
Not knowing about something does not mean that it is unreliable. Also, this statement is paraphrased in the first line of the text already. So we cannot say that this is a weakness as it has already been considered.
C – Correct
Experts’ opinion does not always have to be correct. Also, this statement says that experts have an opinion and opinions are not facts.
D – Wrong
We are not interested in how long a technique has been used for.