
Passage: Many pregnant women suffer from vitamin deficiency, but this is not usually due to a lack of vitamins in their diet, but because of the growth of their babies, they have a higher demand for vitamins than others.
Question: Which of the followings is the most important for evaluating the above conclusions?
A. A.Test the diet of some pregnant women who are not deficient in vitamins to determine the content of vitamins
B. B.Test pregnant women and other women who have enough vitamins in their diet and determine if they are vitamin deficient
C. C.Pregnant women and other women with low levels of vitamins in their diet were tested and determined to see if they were deficient in vitamins
D. D.The daily diet of some pregnant women with vitamin deficiency was tested to determine the content of vitamins
Answer: