Limited choice of languages (varies per practice)

Hi,

I just subscribed to this community and I started off with the ‘hard’ practice “Malvika gets bored with her cats”. I wrote it in C#, my favorite language.
Unfortunately you don’t seem be able to submit this solution in c#, right? I didn’t expect it because C# is a choice in many other practices. Why can’t I choose c# in this case? Or am I wrong?

Anyway, I’m willing to share my solution in case you guys are interested, it was fun solving this problem!

Cheers Erik