The sentence "How many cookies did Darryl eat?" is interrogative, as it is asking a question. Therefore, a question mark should be inserted at the end of the sentence.
The sentence inquires about the quantity of cookies consumed by Darryl. By using the word "how," it seeks to ascertain the specific number of cookies he ate.
In written English, a question mark is used to indicate direct questions that require a response or seek information. In this case, the sentence prompts the listener or reader to provide details about the number of cookies consumed by Darryl.
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