The answer is A. Fish
Polyunsaturated fats is very beneficial and will significantly lower your risk of heart disease if implemented in your diet, - according to the American Heart Association
It commonly found in Fish, Algae, and Leafy Greens.
NB : Avocados, Almonds, and Olive Oil are the best source of monosaturated fats, which is still good for your body compared to saturated and trans fat