Three Statements are given followed by Three conclusions numbered I, II and III.
Assuming the statements to be true, even if they seem to be at variance with commonly known facts, decide which of the conclusions logically follow(s) from the statements.

Statements:
All books are hard.
Some hard are stone.
Some stone are cars.

Conclusions:
I. Some hard are books.
II. All hard are stone.
III. Some cars are stone.