György Buzsáki, the Biggs Professor of Neuroscience at the New York University Grossman School of Medicine, conducted a study of mice brain cells to investigate According to Buzsák's research, certain experiences are immediately followed by five to twenty "sharp wave ripples" of neurons that linger in the brain until sleep, during which the ripples are reactivated and consolidated into a lasting memory. Which choice completes the text so that it conforms to the conventions of Standard English? Choose 1 answer: (A) how are mammalian experiences converted into permanent memories? (B) how are mammalian experiences converted into permanent memories. (C) how mammalian experiences are converted into permanent memories? (D) how mammalian experiences are converted into permanent memories.

To determine the correct choice that completes the text in accordance with the conventions of Standard English, we need to analyze the options based on punctuation and sentence structure. The sentence provided is: "György Buzsáki, the Biggs Professor of Neuroscience at the New York University Grossman School of Medicine, conducted a study of mice brain cells to investigate ______." This sentence is leading into a statement or question about the investigation. The correct completion should maintain the flow of the sentence and adhere to grammatical rules. Let's evaluate the options: (A) "how are mammalian experiences converted into permanent memories?" - This is a question format but does not fit well as a continuation of the statement. (B) "how are mammalian experiences converted into permanent memories." - This is also a question format but ends with a period, which is incorrect for a question. (C) "how mammalian experiences are converted into permanent memories?" - This is a statement that ends with a question mark, which is not appropriate in this context. (D) "how mammalian experiences are converted into permanent memories." - This is a declarative statement that fits well as a continuation of the sentence and ends with a period, making it grammatically correct. Based on this analysis, the best choice is: **(D) how mammalian experiences are converted into permanent memories.**