What is the action that involves obtaining tickets from the box office?

The selected answer accurately captures the essential action of obtaining tickets, as it directly states what process takes place: you pick your tickets up from the box office. This option effectively summarizes the act of obtaining tickets, emphasizing the physical act of collecting the tickets. The clarity and directness of the phrase make it a suitable choice for illustrating the specific action being discussed.

In contrast, the other options either ask questions or describe broader aspects of ticket sales or collection procedures, which do not focus solely on the action of gaining possession of tickets from the box office. For example, asking about the protocol or actions required may provide useful information but doesn't pinpoint the straightforward process of ticket retrieval. Thus, option B stands out as the most precise description of the action requested in the question.