How are passenger seats designated when moving from left to right in the aircraft?

The designation of passenger seats moving from left to right in an aircraft is typically organized with rows labeled with letters that indicate specific seats. The correct answer highlights that seats are designated as AC and DF. This designation represents how the seating layout is configured, where 'A' and 'C' are typically on one side of the aircraft (usually the left side) and 'D' and 'F' are on the opposite side (usually the right side).

This system helps both passengers and crew easily identify seats and understand their location in the aircraft, enhancing the boarding process and making it easier for the crew to assist passengers finding their designated seating. The row designation forms a logical structure that is consistently used across airline operations, facilitating a more organized environment onboard.

Other choices, such as row numbers or size indications, do not capture the specific left-to-right seating designation effectively. Row numbers indicate the location along the length of the aircraft but do not specify the lateral arrangement of seats. Similarly, seat size is irrelevant to the designation of seats in this context, as it does not correlate with how passengers are seated in rows.