A test response.
In the other options, slang could be used for literary effect.
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Answer:the innermost/part of a building /an inner sanctum
Explanation:
<span>The correct answer is C. A chain of cause and effect contains an initial incident and a resulting consequence that occurs because of the initial incident. Here, the initial incident is the technology that allows cell phones to be used for texting. The result is that this texting often replaces email.</span>