I believe the descriptive detail would be <span>"backlit by the noon sun"
In literature, descriptive details is anything that would create better sensory experiences among the readers.
The descriptive details involves any specific information in a certain situation in order to make the readers feel like they experiencing it directly.
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You would use a comma. The semi colon acts when both what is in front and behind it can stand alone as a sentence. “With technology in the hands of so many people” does not make sense standing alone.
The answer is C. You're welcome, if you have anymore questions. Please ask.