All of the Following People Are Likely to Resist Persuasive

All of the following people are likely to resist persuasive attempts to adopt a different brand of soap EXCEPT

A) Tanya, who loves the way her soap smells.
B) Jack, who does not have a vested interest in any particular brand of soap.
C) Kelly, who has previously made public commitments to her favorite brand of soap.
D) Rafael, who is knowledgeable on the subject of soap.