NTSE Stage 2 MAT 2016 Question Paper

In the question below, there are three statements followed by four conclusions numbered I, II, III, and IV. You have to consider every given statement as true, even if it does not conform to the well-known facts. Read all the conclusions and then decide which of the conclusions can be logically derived from the given statements.
Statements : All frogs are snakes Some snakes are birds All birds are apples
Conclusions :
I Some apples are frogs
II No apple is a frog
III Some snakes are apples
IV All birds are snakes