Which of these options correctly defines hypertension?

Hypertension is appropriately defined as a medical condition characterized by high blood pressure. In this context, high blood pressure refers to the force of blood against the walls of the arteries that is consistently too high. This condition can lead to various health issues, including heart disease, stroke, and kidney problems, if not managed properly.

In contrast, the other options present attributes that do not relate to hypertension. Low blood pressure is a different condition altogether and is not linked with hypertension. High cholesterol levels are associated with cardiovascular risks but are distinct from blood pressure. Normal blood pressure indicates a healthy state and does not describe hypertension. Thus, option C is the correct choice as it accurately captures the essence of hypertension.