The answer is d. because collective is not as knid of verb it's a kind of noun.
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Here is your answer to this question.
Answer : <em>The demand for healthcare workers is on the rise. </em>
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<em>The increase in the demand is strongly correlated with the trends regarding diet and daily activities that people in the United States participate in.</em>
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<em>The increasing consumptions of fast food along side the diminsihing amount of the physical exercise due to technologies developmet, caused the average amount of people to become much more likely to experience illnesses. This had lead to the increasing demand of the healthcare workers. </em>
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So that the reader understand how they lived.
