What multimedia element would best clarify information for a speech about bicycle maintenance?

a video clip of a dirt bike race
a logo of a famous bicycle manufacturer
a diagram of bicycle parts
a chart comparing bicycle prices

Realism was a fairly influential and widespread literary movement in the united states in the latter half of the nineteenth century. which american writer is among the pioneers of american realism? a. ernest hemingway b. f. scott fitzgerald c. j. d. salinger d. mark twain