Answer 1

Hi nayomal, this is an often question and it´s easy to stand:
-C is a language created by ISO. It´s so simple and is useful for microchips, drivers...
-C++ is a free language, it is similar to C but C++ is more complex, is used for a lot of things, for exaple 3D games or data structures...
-C# was created by microsoft and it is a mix of C++ and java.
Regards.