Which bus model has a length of 40 feet?

The correct answer indicates that both the Xcelsior and New Flyer bus models include 40-foot length options. The Xcelsior is a well-known bus model manufactured by New Flyer Industries, which offers multiple configurations, including a standard 40-foot length. New Flyer, as a brand, also encompasses various bus models that typically include a 40-foot option. Therefore, it is accurate to state that both the Xcelsior as a model and New Flyer as a brand offer buses that are 40 feet long.

The other choices do not encompass the same level of detail. The term "Articulated" refers to a type of bus design that usually exceeds 40 feet in length, commonly around 60 feet, as these buses are designed to transport larger numbers of passengers with a flexible joint connecting two sections. Thus, when considering standard configurations, articulated buses do not apply to the 40-foot specification. A choice that solely mentions New Flyer would not capture the specificity of the Xcelsior model, which is part of the New Flyer lineup.