Which one of the following vegetables provides four important nutrients—vitamin a, vitamin c, folic acid, potassium—and dietary fiber?
a. spinach
b. broccoli
c. carrots
d. sweet potatoes

The answer is letter A.

Spinach is also known as the super food because of its high concentrations of various vitamins and minerals. It is also contains powerful antioxidants like beta-carotene, lutein, and zeaxanthin that are responsible for immune system protection. The best way to prepare spinach is to boil it for about a minute. This is to help reduce concentrations of oxalic acids while, minimizing the loss of its major nutrients and flavors. It is known to be the super food because it has nutritional contents that can prevent cancer.

Wash your hands often and recycle your trash instead of just throwing it away.