The correct answer is: A. Compiler
A compiler is a computer program that transforms source code written in a programming language (the source language) into another computer language (the target language), without explicitly listing intermediate steps. The most common use of compilers is to translate high-level programming languages into machine code, which can then be executed by a computer.
Assemblers are similar to compilers in that they translate source code into machine code, but they do so one instruction at a time. This makes them slower than compilers, but also more efficient, as they can generate code that is tailored to the specific hardware platform on which it is running.
Interpreters are similar to compilers in that they translate source code into machine code, but they do so one instruction at a time, and then execute that instruction immediately. This makes them slower than compilers, but also more flexible, as they can be used to execute programs that are written in languages that are not supported by the compiler.
Language processors are a general term for any program that translates source code into another form. This includes compilers, assemblers, and interpreters, as well as other types of programs such as code generators and debuggers.
The answer to the question is A. Compiler.