Artificial intelligence relies heavily on deep learning, a process where algorithms analyze layers of data—specifically, the hidden nodes of a neural network ______ to identify complex patterns and features.
Which choice completes the text so that it conforms to the conventions of Standard English?
network to
network: to
network, to
network—to
Correct Answer: D
Choice D is the best answer. The phrase "specifically, the hidden nodes of a neural network" is an interruption or nonrestrictive element that adds detail. Since it begins with a dash (implied by the structure "data—specifically"), it should end with a dash to grammatically close the interruption before the sentence continues.
Choices A, B, and C are incorrect because they do not properly close the nonrestrictive element initiated by the dash earlier in the sentence.