A large group of instruments playing together that includes a string section.

• A. Measure
• B. Orchestra
• C. Concert band
• D. Jazz combo

Answer: (B)

This is about identifying a large instrumental ensemble that includes a string section. An orchestra brings together multiple instrument families—strings (violin, viola, cello, bass) plus woodwinds, brass, and percussion—with the string section forming a central part of its size and sound. A concert band is large too, but it relies mainly on winds and percussion and doesn’t feature a full string section as a core component. A jazz combo is a small group focused on improvisation, not a large ensemble with a prominent string section. A measure is simply a unit of musical time. So the best match is orchestra.