Research will be done over the Circulatory System also known as the Cardiovascular System.
Research disease associated with this system
Choose 3 diseases and explain the symptoms of each disease
Explain the treatment for each disease

Explanation:

1). coronary artery disease = damage to major arteries of the heart, treated by blood thinners, change of diet, exercise.

2). high blood pressure = force of blood against artery walls are too high. treatment is diet with less sodium, more exercise & diuretics,(rids body of excess fluids).

3). cardiac arrest (heart attack). unexpected loss of breathing, consciousness, heart function. treatment is antiarrithmic drugs, pacemaker, blood pressure support, change of diet.

i think the answer would be d