Answer:
The flight crew <em><u>are</u></em> attentive to the passengers.
<em>(</em><em>you have already given the explanation.</em><em>)</em>
As crew is a collective noun your answer will be are .
The correct answer among all the other choices is A.) attributes. This element is analogous to "sweet herbs" in this analogy from Little Women by Louisa May Alcott. Thank you for posting your question. I hope this answer helped you. Let me know if you need more help.
<span>B Experts today estimate 20,000-30,000 laborers worked on the pyramid at any one time.
This is the best option out of all the options. The statement should support the idea that many people were needed to build the pyramid. Options A and C do not really indicate the amount of people the were necessary to build the pyramid. B and D are the only ones that give numbers. Option D however is not correct because even though it says that the work crews needed to be divided into smaller groups, it doesn't give a true indication of the sheer amount of workers needed. Option B is a clear estimate of the tens of thousands of workers necessary to build a pyramid.
</span>
