I believe the correct answer is A. because Her; subject means open or exposed to some unfortunate or undesirable thing. So in another words you say her in the line at the cash register, so are probably not happy to see her.
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Answer:
To say the same thing but in your own words.
Answer:
Down below :)
Explanation:
For number one: The new system is contactless.
For number two: The new system uses skin color to monitor pulse.
For number three: The new system uses infrared cameras.
Hope this helped!