Which condition is a client with elevated LDL and a sedentary lifestyle at risk for?

A client with elevated LDL (low-density lipoprotein) levels and a sedentary lifestyle is at a significant risk for heart disease. Elevated LDL cholesterol is often referred to as "bad" cholesterol because it can lead to the buildup of plaque in the arteries, which narrows them and reduces blood flow. This process is known as atherosclerosis. Over time, atherosclerosis can result in coronary artery disease, which can ultimately lead to heart attacks or other cardiovascular problems.

Sedentary lifestyle further exacerbates the risk factors associated with heart disease. Physical inactivity is known to contribute to higher LDL levels and is associated with obesity, hypertension, and other metabolic disorders. When combined, these factors significantly increase the risk of developing heart disease, making it a primary concern for individuals with similar profiles.

The other conditions listed, while they may have some association with sedentary behavior or elevated LDL, are not as directly linked to the consequences of high LDL levels and a lack of physical activity as heart disease is. Thus, the correct choice reflects the most immediate and relevant health risk for this client.