The answer is A. Pseudocode.
Pseudocode is a high-level description of an algorithm that uses short phrases, natural language, and mathematical notation to describe the steps the procedure must take. It is a way of writing code that is easy for humans to read and understand, but it can also be translated into machine code.
Source code is the actual code that is written in a programming language. It is a set of instructions that tells the computer what to do. Source code is typically written in a human-readable format, but it can also be written in a machine-readable format.
A flowchart is a diagram that shows the steps of an algorithm. It is a visual representation of the algorithm that can be helpful for understanding how it works.
An algorithm is a set of instructions that tells the computer how to solve a problem. It is a step-by-step process that can be followed to achieve a desired result.