Final answer:
Essential hypertension primarily results from a combination of d) genetic and environmental factors, not solely from an identifiable cause, cardiovascular disease, or excess body fat.
Step-by-step explanation:
Essential hypertension is the result of d) genetic and environmental factors.
It is a condition where the blood pressure in the arteries is persistently elevated, commonly defined as blood pressure at or above 140/90 mm Hg. This condition usually does not show symptoms, hence individuals may be unaware they have it. The factors contributing to essential hypertension include a combination of genetics and lifestyle choices such as diet, alcohol consumption, and body fat. Although it's a major risk factor for cardiovascular disease, hypertension can be managed through medication and healthy lifestyle changes like exercise and diet.