The judiciary, legal institutions and duties to the court — SQE1 Legal system question

Quentin, a solicitor with higher rights of audience, is representing Riverbank Ltd at a High Court hearing. While preparing, he finds a recent Court of Appeal decision that is directly against Riverbank's main argument. Counsel for the other side has not cited it in their skeleton argument, and Quentin suspects they are unaware of it. Riverbank's managing director tells Quentin not to mention the case, saying 'it is their job to find it, not ours'.

What should Quentin do?

1. AFollow his client's instructions, because his duty to act in the client's best interests prevails over any duty to the opposing party.
2. BDraw the court's attention to the Court of Appeal decision, because he must bring relevant authorities likely to have a material effect on the outcome to the court's attention even if they are adverse.
3. CDisclose the decision only if the judge asks him directly whether there is any adverse authority.
4. DDisclose the decision to the opposing counsel privately, but say nothing to the court.
5. EWithdraw from the case immediately without explanation, because he can no longer act for Riverbank.