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:
All plants are herbs.
Some herbs are trees.
All trees are shrubs.

Conclusions:
I. Some shrubs are plants.
II. Some shrubs are herbs.
III. Some trees are plants.