Final answer:
The answer is 2.ABA because it represents ternary form.
Step-by-step explanation:
The answer is 2.ABA because it represents ternary form. Ternary form is a three-part musical form that is represented by the structure ABA. In this structure, the A section is followed by a contrasting section B, and then returns to the A section. Each section can be further divided into smaller sections.