The least possible Venn diagram for the given statements is as follows -
Conclusions: I. Some covers are book → True (It is definitely true from the Venn diagram) II. Some books are not black → True (It is definitely true some books are covers and no cover is black so some books are not black) III. No black is cover → True (It is definitely true from the Venn diagram) Hence, ‘All conclusions (I), (II) and (III) follows’ is the correct answer.