Binary form consists of two sections, both repeated (A A' - A in tonic, A' in either dominant or relative major).

• A. Rounded binary form
• B. Binary form consists of two sections, both repeated (A A' - A in tonic, A' in either dominant or relative major)
• C. Ternary form
• D. Simple form

Answer: (B)

Binary form is built from two main sections, each of which is repeated. The first section stays in the home key (tonic) and presents material that is heard twice as A then A’. The second section shifts to a related key—most commonly the dominant or the relative major—and that section is also repeated. The description given matches this structure exactly: two sections, both repeated, with the first in tonic and the second in a related key (dominant or relative major). This pattern—A A’ followed by a contrasting section in a new key—is the hallmark of binary form. For comparison, ternary form adds a third section that returns to something akin to the opening material, and rounded binary is still two-part but typically involves the A material reappearing toward the end of the second section.