Explanation:

The question asks for the term describing the process of writing computer instructions. Option A, 'Documenting', refers to the creation of explanatory materials (like comments, user manuals, technical specifications) that describe how a program works or how to use it. It is not the act of writing the instructions themselves. Option B, 'Coding' (or programming), is the direct process of writing computer instructions using a specific programming language (e.g., Python, Java, C++). This precisely matches the description. Option C, 'Compiling', is the process of translating source code written in a high-level programming language into machine code or an intermediate code that a computer can execute. This happens *after* the coding phase. Option D, 'Assembling', is similar to compiling but specifically refers to the translation of assembly language code into machine code. This also occurs after the instructions have been written in assembly language. Therefore, 'coding' is the correct term for the act of writing computer instructions.