Pronoun error A) The setting for the movie called for a post-apocalyptic future, with streets filled with rusted machinery ; lacking the time needed for them to rust naturally, the director had them all painted. -> Pronoun agreement error - Machinery is a collective noun which is singular so need us...

far Vs much

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 ...

Here the comparison is to the nouns Humming birds Vs Insects not to the action verbs. So "Like" should be used instead of "as"

so the answer is B

IMO A

IMO B Genes can jump like pearls move.

what is OA ?

IMO C

IMO : B