Q:

C support in visual studio 2017

Not C# or C++, but C. Is there any C support in Visual Studio? 

A:

Using the Visual Studio Installer if you click on your already installed version of Visual Studio (in the image I clicked on my VS 2017 Community).   

Under Individual components --> Compilers, build tools and run-times you can check Clang/C2.  Clang is a C compiler. 

Answer: by default it appears not, but you can install the Clang component and it appears you will be able to. 