Answer: It repeats the word "ask" in sentences with similar structures.
Explanation: The second and fourth options are completely unrelated with the concept of parallelism. The first and third options, on the other hand, are both related to parallelism, but the third option must be discarded because the contrast between "ask" and "ask not" is not repeated in each of the paragraphs; only the verb <em>ask</em> in its imperative form is repeated in each sentence.
It’s important to use DNA as evidence. If you don’t give consent it’s possible that criminal could get away. Or you might be the criminal! This is something that the police should be able to get a hold of without consent. (For investigation purposes only!!!!)
The answer is: [C]: "leave out".
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