Statements : Some books are pens. No pen is pencil. Conclusions : I. Some pens are books. II. Some pencils are books. III. Some books are not pencils. IV. All pencils are books.

Answer: Option C

Since one premise is particular and the other negative, the conclusion must be particular negative and should not contain the middle term. Thus, III follows. I is the converse of the first premise and so it also holds.