A person can achieve optimum daily nutrition by

Aeating a variety of healthy foods.
Bexcluding all fat from his or her diet.
Ceating large amounts of lean protein.
Ddrinking at least six glasses of juice

Verified Answer :

Neuron

Somebody who wants to achieve optimum daily nutrition will have to eat a variety of healthy foods (A) 

any of the other answers in this case also can contribute to a healthier nutritional lifestyle, however, the best among them is to eat a large variety of healthy foods, as recommended by WHO as well as different food experts and scientists.