In each question below, there are three statements followed by four conclusions numbered I, II, III and IV. You have to take the given statements to be true even if they seem to be at variance with commonly known facts and then decide which of the given conclusions logically follow (s) from the given statement.
Statements : Some birds are stones.
Some, tigers are birds.
All stones are grapes.
Conclusions : I. Some stones are birds.
II. Some stones ,are not birds.
Ill. Some grapes are birds.
IV. Some tigers are stones