Final answer:
The question seeks to identify which sentence contains an error for proofreading, but no specific proofreading mark is mentioned. Without more context, we can't accurately answer. However, from the sentences provided, Sentence B has a likely error where the term 'Democratic Party' should be fully capitalized.
Step-by-step explanation:
The question is asking which sentence contains an error that would be marked during proofreading, but no specific proofreading mark is mentioned in the question. In English proofreading, several different marks might be applied to indicate a variety of potential issues with a word, such as spelling, punctuation, capitalization, or grammar errors. Therefore, without knowing the exact proofreading mark referred to, it is not possible to determine which sentence the student's question is about. However, based on common proofreading conventions, we can analyze the provided sentences for potential errors.
- Sentence A looks grammatically correct and contains no obvious punctuation errors.
- Sentence B should have 'Democratic Party' capitalized as it is the proper name of a political party.
- Sentence C seems correctly quoted and punctuated.
- Sentence D is correctly structured and punctuated.
If we infer the proofreading mark was intended to indicate a capitalization error, then the sentence with the mistake would be B) Destiny Clark is a member of the Democratic Party.