Best language (Chinese/French/German) for IB/possibly law in London?

I am going to be studying Law at the University of Cambridge next year. Since I have about 17-months before beginning my studies at uni, I was thinking of learning an additional language (other than English) or two during this period, preferably up to fluency level. Having read similar posts on this topic, I understand that my future geographic area of work should help me in deciding what language I should pick up. I plan on working in IB/Law in London for at least 3-4 years before going into grad school in the US (possibly doing an MBA, but more likely a JD). I am not 100% sure whether I'll pursue a career in IB or Law; I'm still browsing posts on this forum and trying to make an informed decision. With that said...

Some background: I am a nineteen year old foreign passport holder, resident outside the UK/USA (I do not possess a European/UK/US passport).

Given the above information and considering the fact that I want to maximize my chances of getting into a good IB/Law position (GS/JP/MS/BAML or KE, White and Case etc.) after uni, what language should I prioritize learning - Chinese, French or German? I understand that French is easier to learn while China possibly has greater influence due to its economy which would lead me to study Chinese; however, I feel if I'm going to be working in London, a European language would help me much more so than an Asian one, so I feel I should first study French and then German (or do both simultaneously). Also, would learning another language help me at all during recruitment at IBs/Law firms?

Thank you for making it this far. I would sincerely appreciate any advice!