The paragraph is most likely which part of an expository essay?

Four-stroke engines can be found in anything from
automobiles to airplanes. Have you ever wondered how
one works? The following pages will discuss each stage in
the four-stroke process, from intake to exhaust, as well as
common engine types that fall under the category of four
stroke.

A. A body paragraph

B. A bridge paragraph

C. The introduction paragraph

D. The conclusion paragraph