What are the primary checks conducted by No.2 for cabin security?

The primary checks conducted by No.2 for cabin security typically focus on specific areas of the aircraft where passengers and crew are most at risk and where security threats could be most pronounced. Option A, which refers to checks at rows 21-33 and the rear left toilet, aligns with standard safety protocols that prioritize areas of the cabin that are further from the cockpit, as these sections can often be less monitored.

In many aircraft, particularly for those configured with a two-class setup or a high-density layout, later rows may be less frequently checked by other crew members during service. Additionally, the rear left toilet could be a point of interest for security checks, given that it is somewhat isolated and could represent a potential area for misuse.

The other provided choices focus on different sections of the cabin or specific facilities that, while they may also need checks, do not align with the established procedures for No.2's main responsibilities regarding cabin security. The rear area and specific rows highlighted in option A reflect the balance between passenger comfort and safety that is paramount during flights.