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The correct answer is A because chunking divides large source documents into smaller retrievable units, often described as passages or chunks. This is fundamental to retrieval-augmented generation because the retriever should return only the most relevant pieces of content, not entire documents. After chunking, the content can be indexed and vectorized so semantic search can match user questions to relevant passages. Option B is wrong because sending entire documents to the model is inefficient, increases token usage, and reduces retrieval precision. Option C is wrong because chunking strategy directly affects retrieval quality; poor chunk boundaries can omit context or return noisy results. Effective chunking improves grounding accuracy by allowing the agent to retrieve focused, meaningful document segments.