"A"
The answer option "A" is the only legitimate answer backed by solid proof. it does not make ridiculous statements or proves a ridiculous point like the others. There is no way the other answer options have such causes and effects, and are highly contraindication, and i would always highly recommend getting knowing your family history as genes play a lot in healthcare.
I would have to say the first one sounds correct to me
The hospital is an important public health tool for addressing heart disease
Answer: They main causes are 1. Sewage, 2. Oil Polution 3.Radioactive waste.
Explanation: ---
The greatest common factor for both would be 15.