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After looking for a pronoun shift error in each sentence, we can select the following option as the one containing the error:
B. If a singer wants to join the chorus, they have to audition.
What is a pronoun shift error?
When there is an inconsistency in the use of pronouns in a sentence or text, we have a pronoun shift error. That means the author began by using one pronoun and then shifted to another while still referring to the same person or thing.
That is what happens in sentence B. The author is talking about a "singer", which is a singular noun. Yet, he uses the pronoun "they" to refer to "singer". "They" is a plural pronoun, which causes the error.
To correct the sentence, we should use either "he" or "she", which are singular pronouns.
Learn more about pronoun shift here:
https://brainly.com/question/24463058