In C language, integer constants can be expressed in decimal, octal and hexadecimal, and option A is expressed in binary, so option A is incorrect. Option b is an octal representation, but in the octal number towel, each number can only be one of the numbers 0 to 7, while in option b, there is a number 8, so option b is incorrect: option c is a hexadecimal representation; Option d is also expressed in hexadecimal, but the hexadecimal number starts with ox, so option d is incorrect, so option c among the four options meets the question.

Extended data:

C language can compile and process low-level memory in a simple way. C language is an efficient programming language, which only produces a small amount of machine language and can run without the support of any running environment.

Although C language provides many low-level processing functions, it still maintains the cross-platform characteristics. C language programs written in standard specifications can be compiled on many computer platforms, including embedded processors and supercomputers.