Final answer:
Ragtime music is characterized by 'ragged' rhythms and a syncopated beat, making it very similar in structure to marching band music, which includes compositions such as Sousa's 'Stars and Stripes Forever'. (Option C).
Step-by-step explanation:
Ragtime music, a uniquely American genre that emerged in the late 19th and early 20th centuries, is characterized by its "ragged" rhythms and a strong, syncopated beat.
The correct answer to the question of which structure ragtime music is very similar to is c. marching band music.
One of the most well-known composers and performers of ragtime was Scott Joplin, who infused elements reminiscent of the tempo used in marching band music.
While ragtime does share some aspects with other musical forms, it's the rhythm and beat that align it most closely with marching band music, with composers like John Phillip Sousa incorporating ragtime's rhythmic style into their compositions, as seen in the famous "Stars and Stripes Forever".