Two 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:

I. All posters are pamphlets.

II. All envelopes are pamphlets.

Conclusions:

I. All pamphlets are envelopes.

II. Some pamphlets are posters.

III. Some posters are envelopes.

Only Conclusion II follows.