personally I'd do C, it's probably one of the most widely used - but it's difficult... Java is also a good choice but also difficult and very differently structured to something like python. To be honest, it's based on your choice. If you want a beginner language, python is most certainly the best way to start. If you want a head start on your course, C or Java is better as they teach that later into the years, but much harder like I said
I had started learning Python before, but my friend said that it would be easier for me to learn other languages if I started with C, so I watched a few videos on C today and I think I will probably continue with C and then learn Python.