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:
No pen is a pencil.
All pencils are chalks.

Conclusions:
I. No chalk is a pen.
II. No pencil is a pen.
III. Some chalks are pencils.

A

Only conclusions I and III follow.

B

Only conclusions II and III follow

C

All of the conclusions follow.

D

Only conclusions I and II follow.