For constipation, which grain, fruit, legume and vegetable would you recommend (based on chart below)

Good sources of dietary fiber including fruits vegetables, legumes and whole grains are highly recommended when one has constipation. Therefore; For constipation; i would recommend legumes such as beans, peas, and Lentils; Vegetables including Brococoli, spinach, The whole grains such as oatmeal, chia seeds, or flaxseeds, fruits such as berries, pears, apples and dried fruits.

The  answer is b since it all happens under ground

Iwould have to say the answer would be nitrogen