Which Soviet fleets contain aircraft carriers?

The correct answer highlights that the Pacific and Northern Fleets are the Soviet fleets that contain aircraft carriers. The Northern Fleet, based in the Barents Sea, operates significant naval power and includes aircraft carriers that can project air power from the sea. Similarly, the Pacific Fleet, located in the Pacific Ocean, also incorporates aircraft carriers to enhance its capabilities, allowing for strategic military operations over vast distances.

The presence of these fleets with aircraft carriers is crucial for naval warfare, providing air support and the ability to launch aerial operations from sea platforms. The aircraft carriers play a vital role in expanding the reach of naval forces, offering both offensive and defensive capabilities in regional conflicts.

In contrast, the other options do not correctly identify fleets known for their aircraft carrier presence. For example, the Southern Fleet typically focuses more on surface combatants and submarines rather than aircraft carriers. This context emphasizes why the Pacific and Northern Fleets are recognized for their strategic assets, including aircraft carriers.