In this question, 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 follows/follow from the statements.

Statements:
Some roses are yellow.
Some yellow are buses.
All buses are green.

Conclusions:
I. All yellow are roses.
II. Some buses are yellow.
III. All yellow are green.