Three statements are given followed by three conclusions I, II and III. Assuming that the information given in the statements is true even if it seems to be at variance from commonly known facts, decide which of the given conclusions logically follow(s) from the statements?

Statement:

All cows are mammals.

All donkeys are mammals.

All mammals are animals.

Conclusion:

I. All donkeys are animals.

II. All animals are donkeys.

III. Some cows are donkeys.