Can I use C launguage instead of javascript or C#?

Questions & Answers
1

I’m not good at C# or Javascript, but I’m not bad at C launguage.
can I use C launguage??

2

I don’t believe so, C# and UnityScript (Unity’s variant of JavaScript) are the two natively supported languages, with C# being the dominant language used. You can find more information here:

https://docs.unity3d.com/Manual/CreatingAndUsingScripts.html