Three statements are given followed by two conclusions numbered I and II. You have to take the statements to be true, even if they seem to be at variance with commonly known facts and decide which of the conclusions logically follow(s) from the statements.
Statements:
I. All Pages are Books.
II. All Books are Catalogues.
III. Some Catalogues are Designs.
Conclusions:
(I) Some Books are Designs.
(II) All Pages are Catalogues.

Statements:
I. All Pages are Books.
II. All Books are Catalogues.
III. Some Catalogues are Designs.

(I) Some Books are Designs. (does not follow)

All Books are Catalogues, Some Catalogues are Designs, it implies that some books are designs does not follow. 
(II) All Pages are Catalogues. (follows)

All Pages are Books, All Books are Catalogues, it implies that All Pages are Catalogues follow.

Thus, Option B is the correct answer.