The correct answer is: Only I, II and III follow.
Statement 1: All jungles are buses.
Statement 2: All books are buses.
Statement 3: All fruits are books.
Conclusion 1: Some fruits are jungles.
This conclusion follows from Statement 1 and Statement 3, by the rule of transitivity. If all jungles are buses, and all fruits are books, then some fruits must be jungles.
Conclusion 2: Some buses are books.
This conclusion follows from Statement 2, by the rule of reflexivity. All books are buses, so some buses must be books.
Conclusion 3: Some buses are jungles.
This conclusion follows from Statement 1 and Statement 2, by the rule of conjunction. If all jungles are buses, and all books are buses, then some buses must be jungles.
Conclusion 4: All fruits are buses.
This conclusion does not follow from the given statements. The fact that all fruits are books does not mean that all fruits are buses. For example, all dogs are animals, but not all animals are dogs.
Therefore, the only conclusions that follow from the given statements are I, II, and III.