KungFuPanda

I think it's more that the answer is "more right" than the other two being wrong because of the inclusion of both Suitability and Diligence, which is what the vignette is more geared towards.

The Fair Dealing standard is more intended to apply to favortism of one client over another that promotes the self-interest of the broker. I.E. routine favortism of the firm's largest clients that pay the most commission. Here the vignette doesn't really discuss that there is a particular reason that Crossley is favoured, at the expense of other clients, or in a way that favours the broker directly in a particular matter.

I got this one wrong too, i have to hope that when Fair Dealing needs to be applied it will be very obvious!