Well, not only is our data bought and sold, It is also used without consent. The key to stealing data is technology, most data is input through some sort of technology. Whether it be someone entering their DOB on a website, or using their credit card for an online purchase. There are some sites that have even confirmed selling their member's data. As to why they do it? I'm not sure, some people believe it's to pander or better aim future products at individuals.
Answer:
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The answer to your question is A.
Adjectives are descriptive words that describe other words and answer a question.
Thus, in your sentence, the adjective is the word red, as is tells the reader what color the shirt is.