The normal cholesterol level in human blood is typically measured in milligrams per deciliter (mg/dL) rather than a percentage. While the provided options are listed in mg%, it is safe to assume that they correspond to mg/dL values. Based on these values, the correct answer would be option 1: 80-120 mg/dL.

Cholesterol levels can vary depending on various factors such as age, sex, and overall health. However, an optimal cholesterol level is generally considered to be below 200 mg/dL. Levels above this range can increase the risk of cardiovascular diseases, including heart attacks and strokes.

It is essential to maintain a healthy lifestyle that includes a balanced diet, regular physical activity, and avoiding smoking and excessive alcohol consumption to help keep cholesterol levels within a healthy range. Alert - correct answer should be .