Puffery is not an ethically questionable negotiation tactic. This is best represented by option B.
Puffery is defined as the practice of exaggerating claims. Typically, these claims are not meant to be taken seriously in a negotiation and no deception is used in the process. Puffery is often opinionated and subjective; because nothing is used to make the other party make detrimental decisions, it isn’t generally considered an ethically questionable negotiation tactic.