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 boats are ships.
All ships are yachts.
All yachts are barges.

Conclusions:
I. Some barges are ships.
II. Some barges are boats.
III. Some yachts are boats.