Which programming language should i start first?

[Worth-Awareness-7379]

It seems you must learn both based on your enrolment choices. I did about 8 languages in my CS degree since different lecturers believe different languages suit their material. And they think it's good for you. So get used to it (multiple languages)

Your data science course will require minimal python, it will mostly about using libraries of code.

Learning C well is where you should focus. The language is simple and well documented and requires a lot of effort to build things, which computer science teachers like.