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The wireless standard that prioritizes data, voice, and video transmissions to improve Quality of Service (QoS) is 802.11e. This standard introduces mechanisms for differentiating traffic types and managing their bandwidth to ensure that time-sensitive data, like voice and video calls, receive the priority they need for optimal performance.

One of the key features brought by 802.11e is the Enhanced Distributed Channel Access (EDCA), which establishes various access categories for traffic, allowing for better management of congestion and reducing latency for real-time applications. This prioritization is essential in environments where multiple types of data are being transmitted simultaneously, as it helps maintain a consistent quality of experience for users.

The other standards mentioned do not specifically focus on QoS improvement through traffic prioritization in the same manner. For example, 802.11n and 802.11ac primarily enhance data throughput and overall network performance rather than explicitly addressing QoS features. Meanwhile, 802.15 refers to wireless personal area networks, which are designed for different applications and do not prioritize traffic in the same way as 802.11e.