Read the given statements and conclusions carefully. Assuming that the information given in the statements is true, even if it appears to be at variance with commonly known facts, decide which of the given conclusions logically follow(s) from the statements.

Statements:
Some bags are pens.
All pens are boxes.
All bags are books.

Conclusions:
I. Some books are boxes.
II. Some boxes are bags.
III. Some books are pens.