Mastering C++ 2025 – 400 Free Practice Questions to Pass the Exam

The '$' symbol is used for variable or macro expansion in a makefile. This means that it acts as a placeholder for a value that can be defined and then used throughout the makefile. This is different from the other options because option A is the pound sign '#' and is used for comments, option C is the colon '' and is used to separate the section of target and dependencies, and option D is the dash '-' which is used to indicate the shell command to be executed. Therefore, the correct answer is B as it is the only option that accurately describes the purpose of the '$' symbol in a makefile.