C is high level language or middle level language?

Answer 1

You should ask your teacher what they want to hear as an answer for this question. In reality there is no such thing as 'middle level language'.

C is a high-level, 3rd generation language. There isn't really a middle-level language, because of the obsolescence of the generational model after the 3rd generation. However, the early history of programming (including the development of C) more or less goes from machine code, assembly code, procedural, and then object oriented and special use. Assuming this simplified perspective, C would be 3rd generation, and C++ and C# would be 4th (i.e. complete support of OOP and encapsulated structure, with little to no access to assembly level code). In this respect, C would be upper-middle-level. Basic could be consider lower-middle, being 2nd generation. Again, this an oversimplification, but Basic had no support for OOP or encapsulation, and was of a generally procedural nature (with the exception of subroutines).