What is the capacity of the 800/800E aircraft in terms of passenger seats?

The correct answer reflects the typical seating capacity for Southwest Airlines' 800/800E model aircraft. This specific aircraft configuration is designed to accommodate up to 175 passengers. This capacity is achieved through an all-economy seating arrangement, which is characteristic of Southwest Airlines’ model for maximizing passenger loads and operational efficiency.

In contrast, the other figures listed do not align with Southwest's seating configuration for this aircraft type. The capacity of 143 and 160 reflects the configurations of smaller aircraft or different models within the fleet that prioritize comfort or first-class seating options, while 190 would exceed the typical layout and safety regulations for this particular model. Therefore, 175 is recognized as the standard capacity for the 800/800E, making it the correct choice.