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Final answer:A composition traditionally ends on a tonic chord, representing the resolution and sense of closure in a musical piece, thus the correct answer is 4) Tonic chord.Explanation:The tonic chord, marked as the 'I' chord in the context of a key's chordal structure, is considered the home chord or point of rest in a musical piece. It signifies the resolution and conclusion of a musical passage.Various chords within a key, such as the dominant ('V') or subdominant ('IV') chords, tend to resolve to the tonic, thus providing a sense of closure. In particular, the resolution from the dominant chord to the tonic is considered essential in Western music for signifying the end of a piece....