Answer: ABA
Explanation: Ternary form is a symmetrical structure in music most often represented by the letters ABA. The A represents a musical idea or ideas, the B represents new, contrasting material, and the final A represents a return to the familiar music heard in the opening of the piece.
Note: Hope this helps you, sorry for the late answer but it will help you in the future.
All My Other Answers:
The dynamic marking in the music are p, f, pp, ff, mf. ABA is not the dynamic marking.
In the music, there has been a difference in the sounds with the term loudness. The dynamic markings help in the analysis of the loudness of the musical sound.
The dynamic marking can be p, f, mf, pp, ff, and many more.
The ABA is not the dynamic marking; it is the structure of the symmetry in the music in ternary form. Thus, option B is correct.
Learn more about dynamic marking, here:
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