Each high-level language has its own syntax which is also called rules of the programming language. Therefore, the correct choice is syntax.
High-level languages have a greater level of abstraction from details of the computer. They focus more on the programming logic which is closely associated with human understanding instead of the underlying hardware modules. Each high-level programming language has its own specific set of rules which is known as the syntax of that language.
Syntax of the high-level languages define structure and formation of the statements in the language. In order to write a program in any high-level programming language, proper syntax of that programming language requires to be followed.
If the syntax of the programming language is not followed properly, the compiler will produce errors. In result, required output of the program will not be generated because of the failure of the program execution.
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