A large group of people who play instruments and march at the same time.

• A. Marching band
• B. Orchestra
• C. Concert band
• D. Rock band

Answer: (A)

The main idea here is recognizing ensembles by how they perform: moving together while playing versus staying in one place. A marching band is a large group of musicians who perform while marching in step, often in parades or on sports fields, combining wind, brass, and percussion with choreographed formations. That combination of size, instrumentation, and coordinated movement is the defining feature of a marching band in real-world settings. The other ensembles describe different contexts: an orchestra is typically seated and performs in concert halls; a concert band is large and can be similar in makeup but is usually focused on concert performances rather than marching; a rock band is a smaller group emphasizing stage performance rather than marching in formation. So the description best matches a marching band.