To solve this question, the user needs to have knowledge of assembly language programming and the purpose of assembly directives.

Assembly directives are commands or instructions in assembly language that are used to provide information to the assembler program. These directives are not executed by the microprocessor, but they instruct the assembler on how to process the assembly code.

Now, let's go through each option and explain why it is right or wrong:

A. The Assembler program: This option is correct. Assembly directives are commands to the assembler program, telling it how to process the assembly code. The assembler program reads the assembly code, processes the directives, and generates the corresponding machine code.

B. The Microprocessor: This option is incorrect. Assembly directives are not commands to the microprocessor. The microprocessor executes machine code, not assembly code. Assembly directives are used by the assembler program to generate the appropriate machine code.

Therefore, the correct answer is:

The Answer is: A