The correct answer is: D. Decompiler
A decompiler is a program that translates machine code back into a form resembling the original source code. This can be useful for debugging, reverse engineering, or simply understanding how a program works.
An interpreter is a program that executes a program line by line, translating each line into machine code and then executing it. This is in contrast to a compiler, which translates the entire program into machine code before executing it.
An assembler is a program that translates assembly language into machine code. Assembly language is a low-level language that is very close to machine code.
None of the above options translate back from machine code something resembling the source language.