Final answer:
The sentence that uses correct end punctuation is: Most choirs are made up of four voices: soprano, alto, tenor, and bass!
Step-by-step explanation:
The sentence that uses correct end punctuation is: Most choirs are made up of four voices: soprano, alto, tenor, and bass! This sentence ends with an exclamation mark, which is the correct punctuation for expressing strong emotion or emphasis. The other sentences use a period (I'm so excited about singing in the concert next week.) and a question mark (Do you need to audition in order to join the choir?) which are appropriate for making a statement and asking a question, respectively.
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