Answer B is the technically correct selection. QoS optimizes voice by reducing loss, delay, and jitter for latency-sensitive packets. Voice traffic is typically classified, marked, and placed into priority treatment so congestion does not cause excessive drops or delay variation. This aligns with Cisco CCNA 200-301 v1.1 because the exam blueprint requires engineers to recognize operational behaviour from configuration symptoms and topology requirements. Merely increasing jitter is harmful, and reducing bandwidth use is not the main QoS mechanism. Treat the distractors carefully: most are real Cisco terms, but they solve a different problem or operate at a different layer. The selected answer is the one that would be used by an engineer on the device or in the design to produce the outcome stated in the question.
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