How many first-class seats are available in the aircraft?

The correct answer, indicating that there are 12 first-class seats available in the aircraft, is supported by a clear understanding of typical configurations in aviation. Aircraft manufacturers often provide detailed seating plans as part of their specifications. In many aircraft, especially those designed for long-haul flights, the first-class cabin typically has a limited number of seats to ensure greater comfort and exclusivity for passengers.

Twelve seats is a common arrangement for first-class sections, allowing for spacious seating layouts and personalized services, which are hallmarks of first-class travel. This configuration balances operational efficiency with passenger comfort, catering to a select group of travelers while maximizing the aircraft's capacity for different service classes overall.

The other figures provided—20, 16, and 10—are not typical for the first-class section in modern aircraft, as they either exceed common configurations or fall below standard offerings that prioritize spaciousness and high-quality service. Thus, acknowledging that 12 first-class seats is a plausible and realistic number aligns with industry standards for aircraft seating arrangements.