Correct answer = D. Lovastatin.
Lovastatin decreases cholesterol synthesis by inhibiting HMG CoA reductase.
Fenofibrate and gemfibrozil increase the activity of lipoprotein lipase, thereby increasing the removal of VLDL from plasma.
Niacin inhibits lipolysis in adipose tissue, thus eliminating the building blocks needed by the liver to produce triglycerides and, therefore, VLDL.
Cholestyramine lowers the amount of bile acids returning to the liver via the enterohepatic circulation.