The circulatory system includes the heart, select one:
a. air passages, and blood vessels.
b. blood, and blood vessels.
c. lungs, and air passages.
d. lungs, and blood vessels.

B. blood and blood vessels. 

All of the other answers include lungs or air passages, which are part of the respiratory system. 

1. b vitamins2. vitamin k3. vitamin d4. examples are walnuts, seeds, tofu5.  total fat, saturated fat, trans fat, cholesterol, sodium, total carbohydrate, dietary fiber, sugars, protein, vitamin a, vitamin c, calcium, and iron.6. 11257. they have to contain reliable information8. less than 10%  9. i didnt read the course so im not surehope that : p

Ithink it’s d. that should be correct.