What is a requirement regarding carrying cargo in the passenger compartment?

Carrying cargo in the passenger compartment has specific requirements to ensure safety and compliance with aviation regulations. The assertion that passenger bags cannot block the aisle is critical because maintaining clear access to aisles is essential for the safe evacuation of passengers in emergencies. In the event of an in-flight incident or an emergency landing, aisles must be accessible to facilitate quick movement for passengers and crew.

The other options, while relevant to cargo handling, do not address the specific requirement regarding the safety of passengers in the aisles. Ensuring that passenger bags do not obstruct pathways is a critical aspect of cabin safety regulations, focusing on the immediate safety of everyone on board rather than the storage of cargo itself.