Which of the following is typically part of the structure of a choral piece?

The structure of a choral piece often includes an introduction, followed by verses and a chorus. This format allows for a clear musical development and progression, which is essential in choral music. The introduction sets the scene or theme for the piece, engaging the audience right from the start. Following the introduction, verses can provide variation and depth to the narrative or emotion being conveyed, while the chorus serves as a memorable, often recurrent refrain that encapsulates the central message of the piece. This combination makes the piece more dynamic and engaging, which is a hallmark of effective choral writing.

The other options fail to encompass the full range of structural elements typically found in choral works. For example, having only a chorus and repeated verses lacks the necessary variety and musical storytelling that an introduction provides, while a single verse followed by a conclusion or just an introduction and conclusion limits the piece's development and emotional impact.