Which of the Following Is a Logical Proof

Which of the following is a logical proof?

A) You should recycle because it is good for your soul.
B) You should attend a bystander intervention workshop because the Women's Center Director is presenting.
C) You should study public speaking because the faculty has made the course a requirement.
D) You should use Ivory soap because it is inexpensive, antibacterial, safe, and effective.