Statements
All calls are mails.
Some mails are posts.
Some posts are letters.
Conclusions
I. All posts being calls is a possibility.
II. No letter is a mail.

A

if both the Conclusion I and Conclusion II follow

B

if either Conclusion I or Conclusion II follows

C

if neither Conclusion I nor Conclusion 11 follows

D

if only Conclusion I follows

E

if only Conclusion II follows