I am interested in getting a PhD in finance, in the area of asset pricing. So I am currently catching up with my mathematics background. I have decided to take some Statistics Theories and Stochastic Processes, but there's one more course that I can take. Which of the following you think is most important?

1, Mathematical Modeling and Applied Mathematics.

2, Numerical Analysis and Scientific Computing.

3, Theory of PDE.

They are all PhD level courses offered by the Maths Department. Thank you for your suggestion. It's gonna be really helpful!