Explanation

High Density Lipoprotein (HDL) is called 'good cholesterol' because it carries cholesterol away from the tissues and artery walls back to the liver for excretion, a process known as reverse cholesterol transport. Higher HDL levels are therefore associated with a lower risk of atherosclerosis, cardiovascular disease and hypertension. Low Density Lipoprotein (LDL), by contrast, deposits cholesterol in arterial walls and is the 'bad cholesterol'. Triglycerides and free fatty acids are energy-storage lipids, not the protective lipoprotein, so only option (A) fits.