Why It Is a Bad Idea to Draw Conclusions from Anecdotal

Why it is a bad idea to draw conclusions from anecdotal evidence?

A) Such conclusions usually go against common sense and conclusions against common sense are not usually valid.
B) Anecdotes are reliable only if they come from experts,which they rarely do.
C) Anecdotes are a single-blind technique,not a double-blind method.
D) There is no way to know if the anecdote is true or if it will generalize to other people and situations.