GitHub Copilot significantly aids in learning a new programming language through its interactive and generative features. GitHub Copilot Chat acts as a conversational tutor, allowing learners to ask questions, request explanations for syntax, and get guidance on common programming patterns directly within their IDE. This provides immediate, contextual support. Additionally, the core feature of converting natural language comments into code allows a learner to describe their intent and see it translated into the new language's correct syntax and structure. This "comment-to-code" workflow is a powerful method for grasping idiomatic expressions and standard library usage without prior knowledge.

B. The /understand command is for the user's benefit, explaining a selected code snippet to the user; it does not help GitHub Copilot itself understand the code.

C. Providing suggestions from an organization's documentation is a feature of GitHub Copilot Enterprise, not a general feature applicable to all users learning a new language.

1. GitHub Docs, "Using GitHub Copilot Chat in your IDE": This document explains how Copilot Chat can be used to get information and support. It states, "You can ask Copilot Chat for help or information about a wide range of programming-related topics... For example, you can ask Copilot Chat to... explain a code snippet, or generate unit tests." This supports option A.

2. GitHub Docs, "Getting started with GitHub Copilot": This guide demonstrates the fundamental "comment-to-code" capability. It shows how writing a comment describing a function's purpose prompts Copilot to generate the corresponding code, which is a direct way for a learner to see their logic implemented in a new syntax. This supports option D.

3. GitHub Docs, "Using slash commands with GitHub Copilot Chat": The documentation for the /understand command states its purpose is to "help you understand the selected code." This confirms the command explains code to the user, invalidating the premise of option B.

4. GitHub Docs, "About GitHub Copilot Enterprise": This page details features exclusive to the Enterprise plan, including the ability to "get summaries of what’s changed in a pull request, and get answers to questions about the organization's repositories." This confirms that sourcing answers from organizational documentation (option C) is a specialized, non-universal feature.