Sentence Correction

Could you please explain why in OA B there's no "and" before "authentic", which is the last term in the list? Thanks.

Although many art patrons can readily differentiate a good debenture from an undesirable one, they are much less expert in distinguishing good paintings and poor ones, authentic art and fakes.

(A) much less expert in distinguishing good paintings and poor ones, authentic art and
(B) far less expert in distinguishing good paintings from poor ones, authentic art from
(C) much less expert when it comes to distinguishing good paintings and poor ones, authentic art from
(D) far less expert in distinguishing good paintings and poor ones, authentic art and
(E) far less the expert when it comes to distinguishing between good painting, poor ones, authentic art, and

distinguishing X from Y

We don't have a list (x, y, and z) so much as two pairs (a and b, c and d). When this occurs, we don't need to use a conjunction to link the pairs.