I use an app called codechecker that helps with me having issues like that cause 99% of the time I'll mess it up.
Answer:
An Australian scientist by the name of John O'Sullivan was inspired by Stephen Hawking's theory of evaporating black holes and their subsequent radio waves. He set out to find them and prove the theory correct. (Wi-Fi was discovered on accident)
The answer, according to my knowledge, is (d) <em>pronunciation.</em>
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<em>- Lee Hae :) Have a great day!</em>