请教狒狒逻辑中的一题

46. Twelve healthy volunteers withthe Apo-A-IV-1 gene and twelve healthy volunteers who instead have theApo-A-IV-2 gene each consumed a standard diet supplemented daily by ahigh-cholesterol food. A high level of cholesterol in the blood is associatedwith an increased risk of heart disease. After three weeks, the bloodcholesterol levels of the subjects in the second group were unchanged, whereasthe blood cholesterol levels of those with the Apo-A-IV-1 gene rose 20 percent.

Which one of the following is moststrongly supported by the information above?

(A) Approximately half thepopulation carries a gene that lowers cholesterol levels.

(B) Most of those at risk of heartdisease may be able to reduce their risk by adopting a low-cholesterol diet.

(C) The bodies of those who have the Apo-A-IV-2 geneexcrete cholesterol when blood cholesterol reaches a certain level.

(D) The presence of the Apo-A-IV-1gene seems to indicate that a person has a lower risk of heart disease.

(E) The presence of the Apo-A-IV-2 gene may inhibit the elevation of blood cholesterol.