The purpose is so that you can really accomplish what your goal is and it helps you also so that you won't waste any time on anything else so you can be committed
The nutrient gained from the lungs is oxygen
It carries diseases from person to person by transmitting blood cells
I would say D because Vera is illustrating going above the boundary to meet your customers needs and recommends products. It's not A because the statement would have implied the number she has served or money she made for the company. B is not correct because that has NOTHING to do with customer satisfaction, but with intelligence (education). Lastly, C is not correct because there's not enough information about how determined she wants to succeed.
