When someone maintains 'sobriety', they are:

Maintaining 'sobriety' refers specifically to the state of abstaining from alcohol and other intoxicating substances. It signifies that an individual is not currently consuming these substances and is often used in the context of addiction recovery. While 'sobriety' can be part of a broader recovery process, the term itself directly emphasizes the absence of alcohol in a person's system. This makes abstaining from alcohol the most precise definition of sobriety among the given choices.

Seeking treatment and recovering from addiction may involve the concept of sobriety, but they do not specifically define the state of being sober. Therefore, while those options relate to the journey of sobriety and addiction recovery, they do not capture the essence of what it means to maintain sobriety itself.