An essay outline simply refers to the way of planning the structure of the essay before one behind writing.
Outlining involves writing of quick phrases or summary sentences for every point that will be written in each paragraph. It is a way to determine the organization of the essay. Therefore, the correct option is D.
C. bicycling to build leg strength. It is the most general activity among the
four choices. Although it says to build
leg strength it is not so specific for what activity it will be used for. The other choices were more specific in their
goals.