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:
Some woods are metals.
All metals are stones.
Some plastics are metals.

Conclusions:
I. Some stones are plastics.
II. Some woods are stones.
III. All stones are metals.